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Слова на букву (2,4-ance (2629)

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achordate, achordal
Referring to animal forms below the Chordata that do not develop a notochord or chorda.
achoresis
Permanent contraction of a hollow viscus, such as the stomach or bladder, whereby its capacity is reduced. [G. a- priv. + choreo, to make room, fr. choros, space]
Achorion
Former name for dermatophytes now placed in the genus Trichophyton or Microsporum. [G. achor, dandruff]
achroacyte
A colorless cell. [G. a- priv. + chroa, color, + kytos, a hollow (cell)]
achrodextrin
SYN: achroodextrin. [G. a- priv. + chroma, color, + dextrin]
achromacyte
SYN: achromocyte.
achromasia
1. Pallor associated with hippocratic facies, emaciation, and weakness, often heralding a moribund state. SYN: cachectic pallor. 2. SYN: achromia. [G. achromos, ...
achromat
A person exhibiting achromatopsia. [G. a- priv. + chroma, color]
achromatic
1. Colorless. 2. Not staining readily. 3. Refracting light without chromatic aberration. [G. a- priv. + chroma, color]
achromatin
The weakly staining components of the nucleus, such as the nuclear sap and euchromatin.
achromatinic
Relating to or containing achromatin.
achromatism
1. The quality of being achromatic. 2. The annulment of chromatic aberration by combining glasses of different refractive indexes and different dispersion.
achromatocyte
SYN: achromocyte.
achromatolysis
Dissolution of the achromatin of a cell or of its nucleus. SYN: karyoplasmolysis.
achromatophil
1. Not being colored by the histologic or bacteriologic stains. SYN: achromophilic, achromophilous. 2. A cell or tissue that cannot be stained in the usual way. SYN: ...
achromatophilia
A condition of being refractory to staining processes.
Achromatopsia
An hereditary disorder of sight due to a lack of cone vision - that type of vision provided by the cone photoreceptors in the retina. In the normal eye, there are some 6 million ...
achromatopsia, achromatopsy
This is the compete form of a., characterized by severe deficiency of color perception, associated with nystagmus, photophobia, reduced visual acuity, and “day blindness”; ...
achromatosis
SYN: achromia. [G. a- priv. + chroma, color]
achromatous
Colorless.
achromaturia
The passage of colorless or very pale urine. [G. a- priv. + chroma, color, + ouron, urine]
achromia
1. Hypopigmentation; absence or loss of natural pigmentation of the skin and iris; may be congenital or acquired. SEE ALSO: depigmentation. 2. Lack of capacity to accept stains ...
achromic
Colorless.
Achromobacter
A Gram-negative bacterial genus of uncertain clinical significance, closely related to members of the Alcaligenes and Ochrobactrum species.
achromocyte
A hypochromic, crescent-shaped erythrocyte, probably resulting from artifactual rupture of a red cell with loss of hemoglobin. SYN: achromacyte, achromatocyte, ghost ...
achromophil
SYN: achromatophil.
achromophilic, achromophilous
SYN: achromatophil (1).
achromotrichia
Absence or loss of pigment in the hair. SEE ALSO: canities. [G. a- priv. + chroma, color, + thrix, hair]
achroodextrin
Dextrin of low molecular weight, formed from starch in a stage of the digestion of the latter by amylase; it gives no color reaction with iodine. Cf.:amylodextrin, ...
achylia
1. Absence of gastric juice or other digestive secretions. 2. Absence of chyle. [G. a- priv. + chylos, juice] - a. gastrica diminished or abolished secretion of gastric juice ...
achylous
1. Lacking in gastric juice or other digestive secretions. 2. Having no chyle. [G. achylos, without juice]
acicular
Needle-shaped or needle-pointed; applied particularly to leaves and crystals. [L. a., small pin]
acid
1. A compound yielding a hydrogen ion in a polar solvent ( e.g., in water); acids form salts by replacing all or part of the ionizable hydrogen with an electropositive element ...
Acid phosphatase
Acid phosphatase is an enzyme that works under acid conditions and is made in the liver, spleen, bone marrow and the prostate gland. Abnormally high serum levels of the enzyme ...
acid red 87
SYN: eosin y.
acid red 91
SYN: eosin B.
Acid, amino
One of the 20 building blocks of protein. The sequence of amino acids in a protein and, hence, the function of that protein are determined by the genetic code in the DNA. Amino ...
Acid, fatty
One of many molecules that are long chains of lipid-carboxylic acid found in fats and oils and in cell membranes as a component of phospholipids and glycolipids. (Carboxylic acid ...
Acid, folic
One of the B vitamins that is a key factor in the synthesis (the making) of nucleic acid (DNA and RNA). A deficiency of folic acid after birth causes a kind of anemia, namely, ...
Acid, nucleic
One of the molecules in the chromosomes of living cells and viruses that plays a central role in the storage and replication of hereditary information and in the expression of ...
Acid, pantothenic
Pantothenic acid is vitamin B5, one of the less well known B vitamins, perhaps because it is widely distributed in nature. Pantothenic acid is virtually ubiquitous. It is ...
Acid, trans fatty
An unhealthy substance, also known as trans fat, made through the chemical process of hydrogenation of oils. Hydrogenation solidifies liquid oils and increases the shelf life ...
Acid-base balance
Acid-base balance refers to the mechanisms the body uses to keep its fluids close to neutral pH (that is, neither basic nor acidic) so that the body can function normally.
acid-citrate-dextrose
A citrate anticoagulant used for the collection and preservation of whole blood. It has largely been replaced by newer anticoagulants (CPD, Adsol) that allow for longer shelf ...
acid-fast
Denoting bacteria that are not decolorized by acid-alcohol after having been stained with dyes such as basic fuchsin; e.g., the mycobacteria and nocardiae.
acidemia
An increase in the H-ion concentration of the blood or a fall below normal in pH. Individual types of a. are listed by specific name, e.g., isovalericacidemia, aminoacidemia, ...
acidify
1. To render acid. 2. To become acid.
acidity
1. The state of being acid. 2. The acid content of a fluid. - total a. (a) an obsolete expression of gastric a., the a. being determined by titration with sodium hydroxide, ...
acidophil, acidophile
1. One of the acid-staining cells of the anterior pituitary. 2. A microorganism that grows well in a highly acid medium. [acid + G. philos, fond]
acidophilic
Having an affinity for acid dyes; denoting a cell or tissue element that stains with an acid dye, such as eosin. SYN: oxychromatic.
acidosis
A pathologic state characterized by an increase in the concentration of hydrogen ions in the arterial blood above the normal level, 40 nmol/L, or pH 7.4; may be caused by an ...
acidotic
Pertaining to or indicating acidosis.
aciduria
1. Excretion of an acid urine. 2. Excretion of an abnormal amount of any specified acid. Individual types of a. are prefixed by the specific acid; e.g., aminoaciduria, ...
aciduric
Pertaining to bacteria that tolerate an acid environment. [acid + L. duro, to endure]
acinar
Pertaining to the acinus. SYN: acinic.
Acinetobacter
A genus of nonmotile, aerobic bacteria (family Moraxellaceae) containing Gram-negative or -variable coccoid or short rods, or cocci, often occurring in pairs. Spores are not ...
acini
Plural of acinus.
acinic
SYN: acinar.
aciniform
SYN: acinous. [L. acinus, grape, + forma, shape]
acinose
SYN: acinous.
acinous
Resembling an acinus or grape-shaped structure. SYN: aciniform, acinose.
acinus
One of the minute grape-shaped secretory portions of an acinous gland. Some authorities use the terms a. and alveolus interchangeably, whereas others differentiate them by the ...
Acinus, pulmonary
The ending of a tiny airway in the lung, where the alveoli (air sacs) are located. In anatomy, an acinus is a round cluster of cells, usually epithelial cells, that looks ...
ACL
The anterior cruciate ligament, one of the ligaments in the knee. The ACL crosses from the underside of the femur (the thigh bone) to the top of the tibia (the bigger bone in ...
aclasia
SYN: aclasis.
aclasis
A state of continuity between normal and abnormal tissue. SYN: aclasia. [G. a- priv. + klasis, a breaking away, a fragment] - tarsoepiphyseal a. (tar′-so-ep′i-fiz′e- al) ...
acme
The period of greatest intensity of any symptom, sign, or process. [G. akme, the highest point]
Acne
Localized skin inflammation as a result of overactivity of the oil glands at the base of hair follicles. Acne happens when oil (sebaceous) glands come to life around puberty, when ...
Acne rosacea
This term is actually a misnomer! The appropriate term is simply rosacea which is a chronic skin disease that affects the middle third of the face with persistent redness over ...
Acne vulgaris
The common form of acne seen most often in teenagers or young adults, acne vulgaris is the result of overactive oil glands that become plugged, red, and inflamed. Most ...
acneform
Resembling acne. SYN: acneiform.
acneiform
SYN: acneform.
acnemia, aknemia
1. Congenital absence of legs. 2. Atrophy of the muscles of the calves of the legs. [G. a- priv. + kneme, leg]
ACNM
Abbreviation for American College of Nuclear Medicine.
ACNP
Abbreviation for American College of Nuclear Physicians.
ACOG (American College of Obstetricians and Gynecologists)
The American College of Obstetricians and Gynecologists is an organization concerned with the quality of OB/Gyn practice in the U.S. It is called "a cog." The members of ACOG are ...
acokanthera
Juice from the leaves and stems of A. ouabaio (family Apocynaceae), a South African arrow poison containing ouabain. [G. akoke, a point, + antheros, blooming]
acolous
Without limbs. [G. a- priv. + kolon, limb]
aconitase
SYN: aconitate hydratase.
aconitate hydratase
An iron-containing enzyme catalyzing the dehydration of citric acid to cis-aconitic acid, a reaction of significance in the tricarboxylic acid cycle. SYN: aconitase.
aconite
The dried root of Aconitum napellus (family Ranunculaceae), monkshood or wolfsbane; a powerful and rapid-acting poison formerly used as an antipyretic, diuretic, diaphoretic, ...
aconitine
The exceedingly poisonous active principle (diterpene alkaloid) of Aconitum sp. and Delphinium sp., formerly used as a cardiac sedative and applied externally for neuralgia.
acorea
Congenital absence of the pupil of the eye. [G. a- priv. + kore, pupil]
Acosta
Joseph (José) de, Spanish Jesuit missionary, 1539–1600. See A. disease.
acoustic
Pertaining to sound, e.g., a. meatus, a. nerve. [Gr. akoustikos]
Acoustic nerve
A cranial nerve concerned with hearing, balance and head position. The acoustic nerve is the 8th cranial nerve. It branches into two parts — a cochlear part integral to hearing ...
Acoustic neurinoma
1. A benign tumor that may develop on the hearing and balance nerves near the inner ear. The tumor results from an overproduction of Schwann cells — small sheet-like cells ...
Acoustic neuroma
1. A benign tumor that may develop on the hearing and balance nerves near the inner ear. The tumor results from an overproduction of Schwann cells — small sheet-like cells ...
acousticophobia
Morbid fear of sounds. [G. akoustikos, acoustic, + phobos, fear]
acoustics
The science concerned with sound. [G. akoustikos, relating to sound]
ACP
Abbreviation for acyl carrier protein; American College of Physicians.
ACP-acetyltransferase
Enzyme transferring acetyl from acetyl-CoA to ACP and releasing CoA to begin fatty acid synthesis. SYN: acetyl transacylase.
ACP-malonyltransferase
An enzyme transferring malonyl from malonyl-CoA to ACP and releasing free CoA; a key step in fatty acid synthesis. SYN: malonyl transacylase.
ACPS
Abbreviation for acrocephalosyndactyly.
Acquired
Anything that is not present at birth but develops some time later. In medicine, the word "acquired" implies "new" or "added." An acquired condition is "new" in the sense that it ...
Acquired deafness
The loss of hearing that occurs or develops some time during a person's life but was not present at birth. Acquired deafness contrasts to congenital deafness which is present at ...
Acquired mutation
A change in a gene or chromosome that occurs in a single cell after the conception of the individual. That change is then transmitted to all cells descended from that cell, ...
acquisition
In psychology, the empiric demonstration of an increase in the strength of the conditioned response in successive trials of pairing the conditioned and unconditioned stimuli. - ...
ACR
Abbreviation for American College of Radiology.
acral
Relating to or affecting the peripheral parts, e.g., limbs, fingers, ears, etc. [G. akron, extremity]
Acrania
A group of the phylum Chordata whose members possess a notochord, gill slits, and nerve cord but no vertebrae, ribs, or skull; e.g., Amphioxus, tunicates, and acorn worms. [G. ...
acrania
Complete or partial absence of a skull; associated with anencephaly. [G. a- priv. + kranion, skull]
acranial
Having no cranium; relating to acrania or an acranius.
acranius
A malformed fetus exhibiting acrania.
Acrel
Olaf, Swedish surgeon, 1717–1806. See A. ganglion.
Acremonium
A genus of fungi (family Moniliaceae, order Moniliales) that causes eumycotic mycetoma; three species, A. falciforme, A. kiliense, and A. recifei, produce whitish to yellow ...
acribometer
An instrument for measuring very minute objects. [G. akribes, exact, + metron, measure]
acrid
Sharp, pungent, biting, or irritating. [L. acer (acr-), pungent]
acridine
10-Azaanthracene; a dye, dye intermediate, and antiseptic precursor ( 9-aminoacridine, acriflavine, proflavine hemisulfate) derived from coal tar and irritating to skin and ...
acridine orange
3,6-bis(dimethylamino)acridine hydrochloride; a basic fluorescent dye useful as a metachromatic stain for nucleic acid s; also used in screening cervical smears for abnormal and ...
acridine yellow
A faintly yellow solution with strong bluish-violet fluorescence; used as a topical antiseptic and as a fluorescent stain in histology. SYN: 5-aminoacridine hydrochloride, ...
acriflavine
An acridine dye, a mixture of 3,6-diamino-10-methylacridinium chloride and 3,6-diaminoacridine; formerly used as a topical and urinary antiseptic, and used as one of Kasten ...
acrimonia
In ancient humoral pathology, a sharp, pungent, disease-provoking humor. [L. pungency]
acrimony
The quality of being intensely irritant, biting, or pungent. [L. acrimonia, pungency]
acrinol
SYN: ethacridine lactate.
acrisorcin
A synthetic topical antifungal agent.
acritical
Rarely used term for: 1. Not critical; marked by no crisis; denoting diseases terminating by lysis. 2. Indeterminate, especially concerning prognosis. [G. a- priv. + kritikos, ...
acro-
Combining form meaning: 1. Extremity, tip, end, peak, topmost. 2. Extreme. [G. akron, highest point, extremity; akros, topmost, outermost, inmost, extreme, tip]
acroagnosis
Loss or impairment of the sensory recognition of a limb. Absence of acrognosis.
acroanesthesia
Anesthesia of one or more of the extremities. [acro- + G. an- priv. + aisthesis sensation]
acroarthritis
Inflammation of the joints of the hands or feet. [acro- + G. arthron, joint, + -itis]
acroasphyxia
Impaired digital circulation, possibly a mild form of Raynaud disease, marked by a purplish or waxy white color of the fingers, with subnormal local temperature and ...
acroataxia
Ataxia affecting the distal portion of the extremities, i.e., hands and fingers, feet, and toes. Cf.:proximoataxia. [acro- + ataxia]
acroblast
Component of the developing spermatid composed of numerous Golgi elements; it contains the proacrosomal granules. [acro- + G. blastos, germ]
acrobrachycephaly
Type of craniosynostosis with premature closure of the coronal suture, resulting in abnormally short anteroposterior diameter of the skull. [acro- + G. brachys, short, + ...
acrocentric
Having the centromere close to one end; said of normal chromosomes 13–15 and 21–22. [acro- + G. kentron, center]
Acrocentric chromosome
A chromosome (one of the microscopically visible carriers of the genetic material DNA) with its centromere (the “waist” of the chromosome) located quite near one end of the ...
acrocephalia
SYN: oxycephaly.
acrocephalic
SYN: oxycephalic.
acrocephalopolysyndactyly
A group of congenital syndromes characterized by abnormal skull shape due to craniosynostosis, brachydactyly, syndactyly, and preaxial polydactyly of hands and/or feet; ...
Acrocephalosyndactyly
An inherited disorder causing abnormalities of the skull and face and the hands and feet. In acrocephalosyndactyly there is closure too-early of some of the sutures of the skull ...
acrocephalous
SYN: oxycephalic.
acrocephaly
SYN: oxycephaly. [acro- + G. kephale, head]
Acrochordon
A small tag of skin that may have a stalk (a peduncle). An acrochordon may appear on skin anywhere although the favorite locales are the eyelids, neck, armpits (axillae), upper ...
acrocinesia, acrocinesis
Excessive movement. SYN: acrokinesia. [acro- + G. kinesis, movement]
acrocontracture
Contracture of the joints of the hands or feet.
Acrocyanosis
Blueness of the extremities (the hands and feet). Acrocyanosis is typically symmetrical. It is marked by a mottled blue or red discoloration of the skin of the fingers and wrists ...
acrocyanotic
Characterized by acrocyanosis.
acrodermatitis
Inflammation of the skin of the extremities. [acro- + G. derma, skin, + -itis, inflammation] - a. chronica atrophicans a gradually progressive late skin manifestation of Lyme ...
Acrodermatitis enteropathica
An historic model for the therapy of genetic disease. In an era (the 1950s) when inherited disorders were usually seen as hopeless, this progressive hereditary (autosomal ...
acrodermatosis
Any cutaneous affection involving the more distal portions of the extremities. [acro- + G. derma, skin, + -osis, condition]
acrodont
Tooth attachment in some lower vertebrates (mainly fish) in which the teeth rest on the edge of the jaw bone rather than in sockets or alveoli. [acro- + G. odous, tooth]
acrodynia
1. Pain in peripheral or acral parts of the body. 2. A syndrome caused almost exclusively in the past by mercury poisoning : in children, characterized by erythema of the ...
acrodysesthesia
Abnormal and unpleasant sensations in the peripheral portions of the extremities. [acro- + dysesthesia]
acrodysostosis
A disorder in which the hands and feet are short with stubby fingers and toes. Growth retardation is progressive. Mental retardation and marked nasal hypoplasia are also present; ...
acroesthesia
1. An extreme degree of hyperesthesia. 2. Hyperesthesia of one or more of the extremities. [acro- + G. aisthesis, sensation]
acrogenous
Denoting conida of fungi produced by the conidiogenous cell at the tip of a conidiophore. [acro- + G. genos, birth]
acrogeria
Reduction or loss of subcutaneous fat and collagen of the hands and feet, giving the appearance of premature aging. [acro- + G. geron, old]
acrognosis
Cenesthesia, or normal sensory perception, of the extremities. [acro- + G. gnosis, knowledge]
acrohyperhidrosis
Hyperhidrosis of the hands and feet.
acrohyperkeratosis
focal a. SYN: acrokeratoelastoidosis.
acrokeratoelastoidosis
An autosomal dominant papular keratosis of the palms and soles, with disorganization of dermal elastic fibers; a similar, but acquired, condition may result from actinic ...
acrokeratosis
Overgrowth of the horny layer of the skin, usually nodular configurations, of the dorsum of the fingers and toes, and occasionally on the rim of the ear and tip of the nose. ...
acrokinesia
SYN: acrocinesia.
acromegalia
SYN: acromegaly.
acromegalic
Pertaining to or characterized by acromegaly.
acromegalogigantism
Gigantism in which the facial features, disproportionate enlargement of the extremities, and other signs of acromegaly are prominent. [acro- + G. megas, great, + gigas, giant]
acromegaloidism
Rarely used term for a condition in which body proportions resemble those of acromegaly.
Acromegaly
Condition due to the production of too much growth hormone by the pituitary gland after the end of adolescence. When there is secretion of too much growth hormone before the end ...
acromelalgia
See erythromelalgia. [acro- + G. melos, limb, + algos, pain]
acromelia
SYN: acromesomelia.
acromelic
Affecting the terminal part of a limb. [acro- + G. melos, limb]
acromesomelia
SYN: acromesomelic dwarfism. SYN: acromelia. [acro- + G. melos, limb, + ia, condition]
acrometagenesis
Abnormal growth of the extremities resulting in malformation. [acro- + G. meta, beyond, + genesis, origin]
acromial
Relating to the acromion.
acromicria
The antithesis of acromegaly; a condition in which the bones of the face and extremities are small and delicate; possibly due to a deficiency of somatotropin. [acro- + G. ...
acromioclavicular
Relating to the acromion and the clavicle; denoting the articulation and ligaments between the clavicle and the acromion of the scapula. SYN: scapuloclavicular (1).
Acromioclavicular joint
The acromioclavicular (AC) joint is located between the acromion (a projection of the scapula that forms the point of the shoulder) and the clavicle (the collar bone). This is ...
acromiocoracoid
SYN: coracoacromial.
acromiohumeral
Relating to the acromion and the humerus.
Acromion
The projection of the scapula (the shoulder blade) that forms the point of the shoulder. The acromion is part of the scapula. It protrudes laterally (away from the midline) and ...
acromioplasty
A surgical reshaping of the acromion, frequently performed to remedy compression of the supraspinatus portion of the rotator cuff of the shoulder joint between the acromion ...
acromioscapular
Relating to both the acromion and body of the scapula.
acromiothoracic
SYN: thoracoacromial.
acromphalus
Abnormal projection of the umbilicus. [acro- + G. omphalos, umbilicus]
acromyotonia
Myotonia affecting the extremities only, resulting in spastic deformity of the hand or foot. SYN: acromyotonus. [acro- + G. mys, muscle, + tonos, tension]
acromyotonus
SYN: acromyotonia.
acroosteolysis
Congenital condition manifested by palmar and plantar ulcerating lesions with osteolysis involving distal phalanges of the fingers and toes. Acquired acro-osteolysis has been ...
acropachy
SYN: hereditary clubbing. [acro- + G. pachys, thick]
acropachyderma
SYN: pachydermoperiostosis. [acro- + G. pachys, thick, + derma, skin]
acroparesthesia
1. Paresthesia of one or more of the extremities. 2. Nocturnal paresthesia involving the hands, most often of middle-aged women; formerly attributed to a lesion in the ...
acropetal
1. In a direction toward the summit. 2. Produced successively toward the apex, with the youngest conidium formed at the tip and the oldest at the base of a chain of conidia; ...
Acrophobia
An abnormally excessive and persistent fear of heights. Sufferers experience severe anxiety even though they usually realize that, as a rule, heights pose no real threat to them. ...
acropigmentation
Punctate and reticulate hyperpigmentation of the dorsal surfaces of the fingers and toes beginning in early childhood and usually increasing with age; more common in Asian ...
acropleurogenous
Denoting spores developing at the tip and along the sides of fungal hyphae.
acropustulosis
Pustular eruptions of the hands and feet, often a form of psoriasis. [acro- + pustulosis] - infantile a. a cyclically recurrent vesicopustular and crusting pruritic eruption, ...
acroscleroderma
SYN: acrosclerosis. [acro- + G. skleros, hard, + derma, skin]
acrosclerosis
Stiffness and tightness of the skin of the fingers, with atrophy of the soft tissue and osteoporosis of the distal phalanges of the hands and feet; a limited form of progressive ...
acrosin
A serine proteinase in spermatozoa similar in specificity to trypsin.
acrosome
A caplike organelle or saccule derived from the golgi that surrounds the anterior two-thirds of the nucleus of a sperm cell. Within this cap are enzymes that are thought to ...
acrosomin
A lipoglycoprotein complex present in the acrosomal cap.
acrospiroma
A tumor of the distal dermal segment of a sweat gland. [scro- + G. speira, coil, + -oma, tumor] - eccrine a. SYN: clear cell hidradenoma.
acroteric
Relating to the extreme peripheral or apical parts, such as the tips of fingers and toes, the end of the nose. [G. akroterion, the topmost point]
Acrotheca
Former name for species now placed in the genus Rhinocladiella or Fonsecaea. [see a.]
acrotheca
In fungi, a type of spore formation characteristic of the genus Fonsecaea, in which conidia are formed along the ends and sides of irregular club-shaped conidiophores. [acro- + ...
acrotic
1. Marked by great weakness or absence of the pulse; pulseless. [G. a- priv. + krotos, a striking] 2. Obsolete term relating to the surface of the body, especially the cutaneous ...
acrotism
Absence or imperceptibility of the pulse. [G. a- priv. + krotos, a striking]
acrotrophodynia
Pain, paresthesia, sensory loss, and trophic changes affecting the distal extremities, usually the feet, that can follow prolonged exposure of the limbs to cold and moisture. ...
acrotrophoneurosis
Trophoneurosis of one or more of the extremities. [acro- + G. trophe, nourishment, + neuron, nerve, + -osis, condition]
acrylate
A salt or ester of acrylic acid.
acrylic
Denoting certain synthetic plastic resins derived from a. acid. SEE ALSO: a. resin.
acrylic acids
A series of unsaturated aliphatic acids of the general formula R=CH—COOH; the prototype, acrylic acid (R = CH2) or 2-propenoic acid, is derived from propionic acid by ...
ACS (American Cancer Society)
A "nationwide community-based voluntary health organization dedicated to eliminating cancer as a major health problem by preventing cancer, saving lives and diminishing suffering ...
ACS (American College of Surgeons)
The American College of Surgeons was formed in 1913 under the aegis of Dr. John Miller Turpin Finney "to elevate the standard of surgery, to establish a standard of competency ...
ACT
Abbreviation for activated clotting time.
ACTH
Abbreviation for adrenocorticotropic hormone. - big A. a form of A., produced by certain tumors, which is a larger and more acidic peptide molecule than little A., but is not ...
actin
One of the protein components into which actomyosin can be split; it can exist in a fibrous form (F-a.) or a globular form (G-a.). - F-a. the association of G-a. subunits into a ...
acting out
An overt act or set of actions that provides an emotional outlet for the expression of emotional conflicts (usually unconscious).
actinic
Relating to the chemically active rays of the electromagnetic spectrum. [G. aktis (aktin-), a ray]
Actinic keratosis
A small rough spot on skin chronically exposed to the sun, precancerous, can develop into a skin cancer called squamous cell carcinoma, a process that typically takes years. ...
actinides
Those elements with atomic numbers 89 to 103, corresponding to the lanthanides in the Periodic Table. SYN: actinide elements. [actinium, first element of the series]
actinium
An element, atomic no. 89, atomic wt. 227.05; it possesses no stable isotopes and exists in nature only as a disintegration product of uranium and thorium. [G. aktis, a ray]
actino-
Combining form meaning a ray, as of light; applied to any form of radiation or to any structure with radiating parts. SEE ALSO: radio-. [G. aktis, aktinos, a ray of light, a ...
actinobacillosis
A disease of cattle and swine, occasionally reported in humans, caused by the bacterium Actinobacillus lignieresii. It affects the soft tissues, often the tongue and cervical ...
Actinobacillus
A genus of very small, nonmotile, nonsporeforming, aerobic, facultatively anaerobic bacteria containing Gram-negative rods interspersed with coccal elements. The metabolism of ...
actinohematin
A red respiratory pigment found in certain forms of Actinia (sea anemones). [ actino- + G. haima, blood]
Actinomadura
A genus of aerobic Gram-positive, branching, nonacidfast filamentous bacteria; it may form aerial hyphae and may contain chains of up to 15 spores. [ actino- + Madura, India] - ...
actinomycelial
Relating to the mycelium-like filaments of the Actinomycetales.
Actinomyces
A genus of slow-growing, nonmotile, nonsporeforming, anaerobic to facultatively anaerobic bacteria (family Actinomycetaceae) containing Gram-positive, irregularly staining ...
Actinomycetaceae
A family of nonsporeforming, nonmotile, ordinarily facultatively anaerobic (some species are aerobic and others are anaerobic) bacteria (order Actinomycetales) containing ...
Actinomycetales
An order of bacteria consisting of moldlike, rod-shaped, clubbed or filamentous forms with decided tendency to true branching, without endospores, but sometimes developing ...
actinomycetes
A term used to refer to members of the genus Actinomyces; sometimes improperly used to refer to any member of the family Actinomycetaceae or order Actinomycetales.
actinomycetoma
Mycetoma caused by higher bacteria. Cf.:eumycetoma.
actinomycin
A group of peptide antibiotic agents, isolated from several species of Streptomyces (originally Actinomyces), that are active against Gram-positive bacteria, fungi, and ...
actinomycosis
A disease primarily of cattle and humans caused by the bacterium Actinomyces bovis in cattle and by A. israelii and Arachnia propionica in humans. These actinomycetes are part ...
actinomycotic
Relating to actinomycosis.
Actinomyxidia
A sporozoan order having a double cellular envelope, three polar capsules, and eight spores; parasitic chiefly in segmented worms, such as the common earthworm. [ actino- + G. ...
actinophage
A virus specific for actinomycetes. [actino(myces) + G. phago, to eat]
actinophytosis
1. SYN: actinomycosis. 2. SYN: botryomycosis.
Actinopoda
A class of Sarcodina having slender pseudopodia with a central axial filament. [ actino- + G. pous, foot]
actinosin
A phenoxazone derivative that is the chromophore of the actinomycins.
actinotherapy
In dermatology, sunlight or ultraviolet light therapy.
action
1. The performance of any of the vital functions, the manner of such performance, or the result of the same. 2. The exertion of any force or power, physical, chemical, or mental. ...
activate
1. To render active. 2. To make radioactive.
activation
1. The act of rendering active. 2. An increase in the energy content of an atom or molecule, through the raising of temperature, absorption of light photons, etc., which renders ...
activator
1. A substance that renders another substance, or catalyst, active, or that accelerates a process or reaction. 2. The fragment, produced by chemical cleavage of a ...
Active euthanasia
The active acceleration of a "good" death by use of drugs etc, whether by oneself or with the aid of a doctor. The word " euthanasia" comes from the Greek — "eu" meaning ...
activin
Placental hormone that reaches maximum levels in maternal serum during labor. [active + -in]
Activities of daily living (ADLs)
The things we normally do in daily living including any daily activity we perform for self-care (such as feeding ourselves, bathing, dressing, grooming), work, homemaking, and ...
activity
1. In electroencephalography, the presence of neurogenic electrical energy. 2. In physical chemistry, an ideal concentration for which the law of mass action will apply ...
Activity, drug
A measure of the physiological response a drug produces in the body. A less active drug produces less response (and visa versa).
actomyosin
A protein complex composed of actin and myosin; it is the essential contractile substance of muscle fiber, active with MgATP. - platelet a. the contractile protein of ...
Acuaria spiralis
A nematode parasite in the proventriculus and esophagus, and sometimes the intestine, of chickens, turkeys, pheasants, and other birds. [L. acus, needle; Mod. L. spiralis, spiral]
acuity
1. Sharpness, clearness, distinctness. 2. Severity. [thr. Fr., fr. L. acuo, pp. acutus, sharpen] - absolute intensity threshold a. the minimal light that can be seen. - ...
Acuity test, visual
This test measures how well you see at various distances. It is the familiar eye chart test. The eye chart itself — the usual one is called Snellen's chart — is imprinted ...
Acuity, auditory
The clarity or clearness of hearing, a measure of how well a person hears and monitoring the ability to hear. The word " acuity" comes from the Latin "acuitas" = sharpness.
Acuity, visual
The clarity or clearness of the vision, a measure of how well a person sees. The ability to distinguish details and shapes of objects; also called central vision. The word " ...
aculeate
Pointed; covered with sharp spines. [L. aculeatus, pointed, fr. acus, needle]
acumentin
A neutrophil and macrophage motility protein that links to the actin molecule to control filament length.
acuminate
Pointed; tapering to a point. [L. acumino, pp. -atus, to sharpen]
acuology
The study of the use of needles for therapeutic purposes, as in acupuncture. [L. acus, needle, + G. logos, study]
Acupressure
The application of pressure on specific points on the body to control symptoms such as pain or nausea. Similar in concept to acupuncture but without needles. * * * Application ...
Acupuncture
The practice of inserting needles into the body to reduce pain or induce anesthesia. More broadly, acupuncture is a family of procedures involving the stimulation of anatomical ...
Acupuncturist
A person skilled in the practice of acupuncture, who may or may not be credentialed by a national accrediting body.
acusis
The ability to perceive sound normally. SYN: normal hearing. [G. akousis, hearing]
Acute
Of short duration, rapid and abbreviated in onset, in reference to a disease. “Acute” is a measure of the time scale of a disease and is in contrast to “subacute” and ...
Acute angle-closure glaucoma
Increased pressure in the front chamber (anterior chamber) of the eye due to sudden (acute) blockage of the normal circulation of fluid within the eye. The block takes place at ...
Acute bacterial prostatitis
Inflammation of the prostate gland of sudden (acute) onset due to bacterial infection. The symptoms include chills, fever, pain in the lower back and genital area, body aches, ...
Acute coronary syndromes
A spectrum of conditions involving chest discomfort or other symptoms caused by lack of oxygen to the heart muscle (the myocardium). The unification of these manifestations of ...
Acute epiglottitis
A very rapidly progressive infection causing inflammation of the epiglottis (the flap that covers the trachea) and tissues around the epiglottis that may lead to abrupt ...
Acute fatty liver of pregnancy
Liver failure in late pregnancy, usually from unknown cause. Acute fatty liver of pregnancy (AFLP) typically occurs in first-time pregnancies in the last trimester. AFLP causes ...
Acute idiopathic polyneuritis
Also known as the Guillain-Barre syndrome, a disorder characterized by progressive symmetrical paralysis and loss of reflexes, usually beginning in the leg, with in most cases ...
Acute illness
A disease with an abrupt onset and usually a short course.
Acute membranous gingivitis
This is trench mouth, a progressive painful infection with ulceration, swelling and sloughing off of dead tissue from the mouth and throat due to the spread of infection from the ...
Acute mountain sickness (AMS)
Acute mountain sickness (AMS) is the effect on the body of being in a high altitude environment. AMS is common at high altitudes, that is above 8,000 feet (2,440 meters). ...

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