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Inflammation of the sclera, the tough white outer coat of the eyeball. Classic scleritis affects the sclera itself and is not a benign disease. It may impair vision. The principal ...
Sclero- (prefix)
Sclero- (or scler-) is a confusing prefix because it can refer exclusively to hardness (from the Greek "skleros" meaning hard) but it can also refer to the sclera of the eye. So, ...
sclero-, scler-
Hardness (induration), sclerosis, relationship to sclera. [G. skleros, hard]
Inflammatory induration of the ovary. [sclero- + Mod. L. oophoron, ovary + G. -itis, inflammation]
SYN: sclerotylosis.
The embryonic tissue entering into the formation of bone. [sclero- + G. blastema, sprout]
Relating to both the sclera and the choroid.
Inflammation of the sclera and choroid. - s. anterior a secondary inflammation of the sclera by an extension of a process from the uvea. - s. posterior SYN: posterior ...
Relating to the sclera and the conjunctiva.
1. The cornea and sclera regarded as forming together the hard outer coat of the eye, the fibrous tunic of the eye. 2. A congenital anomaly in which the whole or part of the ...
Localized thickening and tightness of the skin of the fingers or toes. Sclerodactyly is commonly associated with atrophy of the underlying soft tissues. The term "sclerodactyly" ...
sclerodactyly, sclerodactylia
SYN: acrosclerosis. [sclero- + G. daktylos, finger or toe]
Thickening and induration of the skin caused by new collagen formation, with atrophy of pilosebaceous follicles; either a manifestation of progressive systemic sclerosis or ...
Marked by, or resembling, scleroderma.
sclerogenous, sclerogenic
Producing hard or sclerotic tissue; causing sclerosis. SYN: scleratogenous. [sclero- + G. -gen, producing]
Indurated or sclerotic, of unusually firm texture, leathery, or of scarlike texture. SYN: sclerosal, sclerous. [sclero- + G. eidos, resemblance]
Inflammation of both sclera and iris.
Inflammation of the sclera and cornea. [sclero- + G. keras, horn]
Inflammation of sclera, cornea, and iris.
A circumscribed indurated focus of granulation tissue in the skin or mucous membrane. [G. skleroma, an induration] - respiratory s. rhinoscleroma in which the lesion involves ...
Degenerative thinning of the sclera, occurring in persons with rheumatoid arthritis and other collagen disorders. [sclero- + G. malakia, a softening]
1. Any metamere of the skeleton, such as a vertebral segment. 2. Caudal half of a sclerotome. [sclero- + G. meros, part]
A device for determining the density or hardness of any substance. [sclero- + G. metron, measure]
Generalized lichen myxedematosus with diffuse thickening of the skin underlying the papules.
Induration and thickening of the nails. [sclero- + G. onyx, nail, + -ia, condition]
An abnormality in which most of the normally transparent cornea resembles the opaque sclera. [sclero- + G. ophthalmos, eye]
Plastic surgery of the sclera. [sclero- + G. plastos, formed]
SYN: albuminoid (3). SEE ALSO: fibrous protein.
SYN: scleroid.
An injectable irritant used to treat varices by producing thrombi in them.
To harden; to undergo sclerosis.
Sclerosing cholangitis
A chronic disorder of the liver in which the ducts carrying bile from the liver to the intestine and, often, the ducts carrying bile within the liver, become inflamed, thickened ...
Sclerosing panencephalitis, subacute (SSPE)
A chronic brain disease of children and adolescents that occurs months to often years after an attack of measles, causing convulsions, motor abnormalities, mental retardation ...
1. SYN: induration (2). 2. In neuropathy, induration of nervous and other structures by a hyperplasia of the interstitial fibrous or glial connective tissue. [G. ...
Sclerosis, multiple (MS)
The National Multiple Sclerosis Society says of MS that it is "a disease that randomly attacks your central nervous system, wearing away the control you have over your body. ...
Induration and contraction of the tissues. [sclero- + G. stenosis, a narrowing]
A former generic name for strongyle ( hookworm) nematodes and for trichostrongyle worms of horses; now replaced by other genera but still used as a collective term for this ...
Surgical perforation of the sclera, as for the relief of glaucoma. [sclero- + G. stoma, mouth]
Treatment involving the injection of a sclerosing solution into vessels or tissues. SYN: sclerosing therapy.
Induration and brittleness of the hair. SYN: sclerotrichia. [sclero- + G. thrix, hair]
1. Relating to or characterized by sclerosis. 2. SYN: scleral.
SYN: sclera. [Mod. L. scleroticus, hard]
1. In fungi, a variably sized resting body composed of a hardened mass of hyphae with or without host tissue, usually with a darkened rind, from which fruit bodies, stromata, ...
1. A knife used in sclerotomy. 2. The group of mesenchymal cells emerging from the ventromedial part of a somite and migrating toward the notochord. Sclerotomal cells from ...
An incision through the sclera. [sclero- + G. tome, incision] - anterior s. incision into the anterior chamber of the eye. - posterior s. incision through the sclera into the ...
SYN: sclerothrix.
Atrophic fibrosis of the skin, hypoplasia of the nails, and palmoplantar keratoderma; associated with skin and gastrointestinal cancers; autosomal dominant inheritance. SYN: ...
SYN: scleroid. [G. skleros, hard]
Abbreviation for sternocleidomastoid (muscle).
SCN (severe congenital neutropenia)
An condition characterized by a lack of neutrophils, a type of white blood cell that is important in fighting infection. It is usually, but not always, hereditary Children with ...
Plural of scolex.
Infection of the intestine by larvae of lepidopterans (moths and butterflies). [G. skolex, worm, + -iasis, condition]
SYN: scolecoid.
1. Resembling a tapeworm scolex. 2. Wormlike. SEE ALSO: lumbricoid (1), vermiform. SYN: scoleciform. [G. skolekoeides, fr. skolex, worm, + eidos, appearance]
SYN: helminthology. [G. skolex, worm, + logos, study]
The head or anterior end of a tapeworm attached by suckers, and frequently by rostellar hooks, to the wall of the intestine; it is formed within the hydatid cyst in ...
SYN: kyphoscoliosis. [G. scolios, curved, + kyphosis, kyphosis]
An instrument for measuring curves, especially those in lateral curvature of the spine. [G. skolios, curved, + metron, measure]
Sideways (lateral) curving of the spine (the backbone). The degree of scoliosis may range from mild to severe. Scoliosis is often an incidental and harmless finding. People with ...
Scoliosis, acquired
Curvature of the spine due to disease, accident, or surgery gone awry.
Scoliosis, congenital
Curvature of the spine as a result of a musculoskeletal disorder that is present at birth.
Scoliosis, functional
A structurally normal spine that appears to have a lateral curve (scoliosis). Nonstructural scoliosis involves a temporary change of spinal curvature. This is caused by an ...
Scoliosis, idiopathic
Curvature of the spine due to unknown causes. This is the most common type of
Scoliosis, nonstructural
A structurally normal spine that appears to have a lateral curve (scoliosis). Nonstructural scoliosis involves a temporary change of spinal curvature. This is caused by an ...
Scoliosis, structural
A fixed lateral (sideway) curve of the spine. Structural scoliosis often occurs from unknown factors without reference to other physical problems (idiopathic scoliosis). It ...
Relating to or suffering from scoliosis.
An apparatus for stretching the spine and reducing the curve in scoliosis. [G. skolios, crooked, + tonos, tension]
A genus of centipedes characterized by 21–23 pairs of legs. Common U.S. species are S. heros (the Western house centipede) and S. morsitans. [Mod. L., fr. G. skolopendra, ...
A narrow, spoonlike instrument for extracting the contents of cavities or cysts. [A.S. skopa]
Scopolamine less the tropic acid side chain, i.e., 6,7-epoxytropine, or 6,7-epoxy-3-hydroxytropane.
A venerable drug that is a naturally occurring member of a large chemical class of compounds called alkaloids. Scopolamine was first introduced into medical usage in 1902. The ...
The dried rhizome and roots of S. carniolica (family Solanaceae), a herb of Austria and neighboring countries of Europe; it resembles belladonna in pharmacologic action. [G.A. ...
A decomposition product of scopolamine, and an isomer of scopine, in that the epoxy and hydroxyl groups are in different locations.
A device for determining the density of a precipitate by the degree of translucency of a fluid containing it. SEE ALSO: nephelometer. [G. skopeo, to view, + metron, measure]
SYN: voyeurism. [G. skopeo, to view, + philos, fond]
Morbid dread of being stared at. [G. skopeo, to view, + phobos, fear]
A genus of filamentous fungi rarely pathogenic for humans; several species have been implicated in onychomycosis, ulcerating granuloma, and other “mycotic” entities. ...
Relating to, suffering from, or resembling scurvy (scorbutus).
SYN: scurvy. [Mediev. L. form of Teutonic schorbuyck, scurvy]
Heaviness of the head with yawning and stretching, occurring as a prodrome of an infectious disease. [G. skordinema, yawning]
An evaluation, usually expressed numerically, of status, achievement, or condition in a given set of circumstances. [M. E. scor, notch, tally] - APACHE s. Acute physiology and ...
Score, Apgar
A practical method to assess a newborn infant, the Apgar score is a number arrived at by scoring the heart rate, respiratory effort, muscle tone, skin color, and response to a ...
A member of the order Scorpionida; includes the devil s., Vejovis, and the hairy s., Hadrurus. [G. skorpios]
The scorpions; an order of venomous, predaceous, arachnid arthropods characterized by a distinctly segmented bony abdomen terminating in a sharply recurved stinging spine equipped ...
Darkness. [G. skotos]
SYN: Runyon group II mycobacteria. [ scoto- + G. chroma, color, + -gen, producing]
An appliance for aiding one to write in straight lines in the dark or for aiding the blind to write, as used by the historian W.H. Prescott. SYN: noctograph. [ scoto- + G. ...
1. An isolated area of varying size and shape, within the visual field, in which vision is absent or depressed. 2. A blind spot in psychological awareness. [G. skotoma, vertigo, ...
Plural of scotoma.
Relating to scotoma.
An instrument for determining the size, shape, and intensity of a scotoma.
The plotting and measuring of a scotoma. [ scoto- + G. metron, measure]
SYN: nyctophilia. [ scoto- + G. philos, fond]
SYN: nyctophobia. [ scoto- + G. phobos, fear]
SYN: scotopic vision. [ scoto- + G. opsis, vision]
Referring to low illumination to which the eye is dark-adapted. See s. vision.
The protein moiety of the pigment in the rods of the retina.
SYN: retinoscopy. [ scoto- + G. skopeo, to view]
Charles I., Jr., U.S. pediatrician, *1934. See Aarskog-S. syndrome. Henry William Jr., U.S. surgeon, *1916. See S. operation.
H., English scientist. See Scott- Wilson reagent.
scotty dog
The fancied appearance of the articular facets on oblique radiographs of the lumbar spine; the neck of the s. is the pars interarticularis, site of the most common defect in ...
An abrasion or cut caused by something rubbing roughly against the skin. To treat scrape, wash the area with soap and water, and keeping it clean and dry. Alcohol, hydrogen ...
A communicable spongiform encephalopathy of the central nervous system of sheep and goats caused by a prion and characterized by a very long incubation period followed by ...
A specimen scraped from a lesion or specific site, for cytologic examination. SEE ALSO: smear. SYN: scrape.
1. A sheet of any substance used to shield an object from any influence, such as heat, light, x-rays, etc. 2. A sheet upon which an image is projected. 3. Formerly, to make a ...
1. To screen (5). 2. Examination of a group of usually asymptomatic individuals to detect those with a high probability of having a given disease, typically by means of an ...
Screening mammogram
A mammogram (an X-ray of the breast) in women who have no signs of breast cancer. It usually involves two X-rays of each breast. The aim of a screening mammogram is to detect a ...
Screening, kidney disease
Screening (looking) for early kidney disease in people who are not already known to have it. Kidney disease is common and is commonly insidious in onset. The burden of kidney ...
Screening, newborn hearing
Testing of the newborn baby's ability to hear. Newborn screening of hearing is done with automated auditory brainstem response tests or, less often, with what are called ...
A helically grooved cylinder for fastening two objects together or for adjusting the position of an object resting on one end of the s.. - afterloading s. a device for setting ...
The larva of the botfly, Cochliomyia hominivorax, and other similar forms that cause human and animal myiasis. - primary screw-worm an obligatory s. that can penetrate normal ...
1. To write, trace, or mark by making a line with a marker or pointed instrument, as in surveying a dental cast for a removable prosthesis. 2. To form, by instrumentation, ...
Belding H., U.S. nephrologist, *1921. See S. shunt.
Pitted; marked with minute depressions. [L. scrobiculus; dim. of scrobis, a trench]
scrobiculus cordis
SYN: epigastric fossa. [L. pit or fossa of the heart]
Historic term for cervical tuberculous lymphadenitis. [L. scrofulae (pl. only), a glandular swelling, s., fr. scrofa, a breeding sow]
Tuberculosis resulting from extension into the skin from underlying atypical mycobacterial infection, most commonly of cervical lymph node s in children with tonsillar infection ...
Relating to or suffering from scrofula.
Relating to the scrotum. SYN: oscheal.
Removal of all or part of the scrotum. [ scrotum, + G. ektome, excision]
Having the shape or form of a scrotum.
Inflammation of the scrotum.
Surgical reconstruction of the scrotum. SYN: oscheoplasty. [ scrotum + G. plastos, formed]
A pouch of skin which contains the testes, epididymides, and lower portions of the spermatic cords. * * * A musculocutaneous sac containing the testes; it is formed of skin, ...
Scrub typhus
A mite-borne infectious disease caused by a microorganism, Rickettsia tsutsugamushi, characteristically with fever, headache, a raised (macular) rash, swollen glands ...
An apothecaries' weight of 20 grains or one-third of a dram. [L. scrupulus, a small sharp stone, a weight, the 24th part of an ounce, a s., dim. of scrupus, a sharp stone]
Acronym for self-contained underwater breathing apparatus.
Scuba health
Common medical problems in scuba diving include cuts, scrapes and other injuries to the arms and legs and pain in the ear (the "squeezes") due to the difference in pressure ...
Scultetus, Scultet
Originally Schultes, Johann, German surgeon, 1595–1645. See S. bandage, S. position.
A film of insoluble material that rises to the surface of a liquid, as in epistasis. [M.E.]
SYN: dandruff. [A.S.]
A disorder caused by lack of vitamin C. Symptoms include anemia; soft, bleeding gums; and bumps under the skin near muscles. Scurvy in early childhood can cause musculoskeletal ...
SYN: scutiform.
A thin lamina or plate. SYN: scutum (1). [L. scutum, shield] - tympanic s. the thin bony plate separating the epitympanic recess from the mastoid cells.
Shield-shaped. SYN: scutate. [L. scutum, shield, + forma, form]
A genus of centipedes commonly found in the eastern U.S.; the Eastern house centipede is a member of the species S. cleopatra. [L. scutum, an oblong shield]
A yellow, saucer-shaped crust, the characteristic lesion of favus, consisting of a mass of hyphae, pus, and scales. [L. dim. of scutum, shield]
1. SYN: scute. 2. In ixodid (hard) ticks, a plate that largely or entirely covers the dorsum of the male and forms an anterior shield behind the capitulum of the female or ...
Plural of scybalum.
Relating to scybala.
A hard, round mass of inspissated feces. [G. skybalon, excrement]
SYN: scyphoid. [G. skyphos, goblet, cup, + L. forma, form]
Cup-shaped. SYN: scyphiform. [G. skyphos, cup, + eidos, resemblance]
Abbreviation for streptodornase; standard deviation.
Abbreviation for specific dynamic action.
Abbreviation for sodium dodecyl sulfate.
Symbol for selenium.
sea nettle
SYN: Chrysaora quinquecirrha.
sea wasp
SYN: Chiropsalmus quadrumanus.
1. A tight closure. 2. To effect a tight closure. - border s. the contact of the denture border with the underlying or adjacent tissues to prevent the passage of air or other ...
A material used to effect an airtight closure. - dental s. SYN: fissure s.. - fissure s. a dental material usually made from interaction between bisphenol A and glycidyl ...
A form of sound used to determine the presence of a calculus in the bladder.
Carl E., U.S. psychologist, 1866–1949. See S. test.
A form of motion sickness caused by the motion of a floating platform, such as a ship, boat, or raft. SYN: mal de mer, naupathia, vomitus marinus.
A particular phase of some slow cyclic phenomenon, especially the annual weather cycle.
Seasonal affective disorder (SAD)
Depression that tends to occur (and recur) as the days grow shorter in the fall and winter. It is believed that affected persons react adversely to the decreasing amounts of light ...
A surface against which an object may rest to gain support. - basal s. SYN: denture foundation area. - rest s. SYN: rest area.
Seat belt
A belt used to hold an individual in their seat. Motor vehicle accidents are the leading cause of death for teenagers in the United States. Over 70% of those killed were not ...
SYN: pinworm.
See sebo-.
Relating to sebum; oily; fatty. SYN: sebaceus. [L. sebaceus]
Sebaceous cyst
: A sebaceous cyst is a rounded swollen area of the skin formed by an abnormal sac of retained excretion (sebum) from the sebaceous follicles.
Sebaceous gland
A normal gland of the skin which empties an oily secretion into the hair follicle near the surface of the skin.
SYN: sebaceous. [L.]
SYN: sebiferous. [sebi- + G. agogos, leading]
Producing sebaceous matter. SYN: sebiagogic, sebiparous. [sebi- + L. fero, to bear]
Pierre, French anatomist, 1860–1953. See S. hollow, S. muscle.
SYN: sebiferous. [sebi- + L. pario, to produce]
sebo-, seb-, sebi-
Sebum, sebaceous. [L. sebum, suet, tallow]
: A accumulation of scales of greasy skin, often on the scalp. Seborrhea is commonly known as dandruff. Treatment is with gentle washing, avoiding the use of harsh or perfumed ...
Relating to seborrhea.
Seborrheic keratosis
A benign skin lesion resulting from excessive growth of the top layer of skin cells. It usually is found in persons over 30 years old and may be few or numerous. Although ...
An oily secretion of the sebaceous gland which helps to preserve the flexibility of the hair. * * * The secretion of the sebaceous glands. [L. tallow]
Abbreviation for second.
A class of nematodes possessing lateral canals opening into the excretory system and phasmids; it includes most of the familiar nematode parasites of humans and domestic animals, ...
SYN: Secernentasida.
Helmut P.G., German physician, *1900. See S. dwarfism, S. syndrome.
Seckel syndrome
A birth defect syndrome with severe short stature and, characteristically, low birth weight, very small head (microcephaly), receding forehead, large eyes, low ears, prominent ...
An obsolescent sedative and short-acting hypnotic; largely replaced by benzodiazepines.
Second cranial nerve
The second cranial nerve is the optic nerve, the nerve that connects the eye to the brain and carries the impulses formed by the retina — the nerve layer that lines the back of ...
Second stage of labor
The part of labor from the full dilatation of the cervix until the baby is completely out of the birth canal. The second stage of labor is also called the stage of expulsion.
Second-hand smoke
: Environmental tobacco smoke that is inhaled involuntarily or passively by someone who is not smoking. Environmental tobacco smoke is generated from the sidestream (the burning ...
1. SYN: metastasis. 2. The lesions of secondary syphilis.
Secondary amenorrhea
The abnormal cessation of menstruation. Amenorrhea is conventionally divided into primary and secondary amenorrhea. With primary amenorrhea, menstruation never takes place. ...
Secondary amyloidosis
One of a group of diseases (called amyloidosis) in which protein deposits (amyloid) accumulate in one or more organ systems in the body, secondary amyloid is caused by a chronic ...
A compound derived from a steroid in which there has been a ring cleavage. [L. seco, to cut, + steroid]
Secretions. [L. neuter pl. of secretus, pp. of se-cerno, to separate]
An agent that promotes secretion; e.g., acetylcholine, gastrin, secretin. SYN: secretogogue. [ secreta + G. agogos, drawing forth]
Secretary's knee
The patellofemoral syndrome (PFS), the commonest cause of chronic knee pain. PFS characteristically causes vague discomfort of the inner knee area, aggravated by activity ...
A term used to describe a proteinase that acts on amyloid precursor protein to produce peptides that do not contain the entire amyloid β protein (a major constituent of the ...
Secretase, beta-
An enzyme that appears to be directly involved in the early development of Alzheimer's disease. Beta-secretase is a protease (an enzyme that catalyses the splitting of interior ...
To elaborate or produce some physiologically active substance ( e.g., enzyme, hormone, metabolite) by a cell and to deliver it into blood, body cavity, or sap, either by direct ...
Hormone made by glands in the small intestine that stimulates pancreatic secretion. The word "hormone" was coined by the English physiologists Wm. M. Bayliss and Ernest ...
1. Production by a cell or aggregation of cells (a gland) of a physiologically active substance and its movement out of the cell or organ in which it is formed. 2. The solid, ...
SYN: secretagogue.
secretomotor, secretomotory
Stimulating secretion. [secrete + motor, mover]
An individual whose bodily fluids (saliva, semen, vaginal secretions) contain a water-soluble form of the antigens of the ABO blood group. Secretors constitute 80% of the ...
Relating to secretion or the secretions.
1. Capable of being cut or divided. 2. Having the appearance of being divided. [L. sectilis, fr. seco, to cut]
In anatomy, a subdivision or segment. [L.]
1) In anatomy, a slice of tissue. A biopsy obtained by surgery is usually sectioned (sliced), and these sections are inspected under a microscope. 2) In obstetrics, short for ...
Section, Caesarian
Also referred to as a C-section. A procedure in which a baby, rather than being born vaginally, is surgically extracted (removed) from the uterus. As the name "Caesarian" ...
Section, Cesarian
The obstetrical procedure is often spelled this way in the U.S. with just an "e"although the Roman emperor remains Caesar in America with an "ae". Also referred to as a ...
Section, cross
A transverse cut through a structure. The opposite is a longitudinal section.
Section, lower segment Cesarian (LSCS)
A Cesarian section in which the surgical incision (cut) is made in the lower segment of the uterus.
Loss of vision in a sector of the visual field. [sector + G. an- priv. + opsis, vision]
1. Relating to a sector. 2. Cutting or adapted for cutting; denoting the carnassial or shearing molar and premolar teeth of carnivores. [L. sector, cutter]
See gravida.
SYN: afterbirth. [L. secundinae, the afterbirth, fr. secundus, second]
SYN: afterbirth. [L. secundinae, the afterbirth]
See para.
To bring under the influence of a sedative. [L. sedatus; see sedation]
1. The act of calming, especially by the administration of a sedative. 2. The state of being calm. [L. sedatio, to calm, allay]
A drug that calms a patient down, easing agitation and permitting sleep. Sedatives generally work by modulating signals within the central nervous system. These sedatives can ...
Abbreviation for spondyloepiphyseal dysplasia congenita.
SYN: sexdigitate. [L. sex, six, + digitus, digit]
1. Insoluble material that tends to sink to the bottom of a liquid, as in hypostasis. SYN: sedimentum. 2. To cause or effect the formation of a s. or deposit, as in the case ...
SYN: sediment (2).
Formation of a sediment.
Sedimentation rate
A blood test that detects and monitors inflammation in the body. It measures the rate at which red blood cells (RBCs) in a test tube separate from blood serum over time, becoming ...
A centrifuge.
A photographic apparatus for the automatic recording of the blood sedimentation rate. [ sediment + G. metron, measure]
SYN: sediment (1). [L.] - s. lateritium SYN: brickdust deposit.
A 2-ketoheptulose formed metabolically in the pentose monophosphate pathway as the 7-phosphate by condensation of d-xylulose 5-phosphate and d-ribose 5-phosphate, splitting out ...
sedoxantrone trihydrochloride
A topoisomerase II inhibitor in cancer chemotherapy.
1. The reproductive body of a flowering plant; the mature ovule. SYN: semen (2). 2. In bacteriology, to inoculate a culture medium with microorganisms. [A.S. soed]
Otto L.G.A., German neurologist, 1837–1912. See S. sign.
Albert, U.S. embryologist, 1850–1910. See S. pocket, S. pouch.
Segawa Dystonia
An important variant form of dopa-responsive dystonia (DRD). DRD typically begins in childhood or adolescence with progressive difficulty in walking and, in some cases, with ...
1. A section; a part of an organ or other structure delimited naturally, artificially, or by invagination from the remainder. SYN: segmentum [TA]. SEE ALSO: metamere. 2. A ...
Segment, genomic
A region of the genome; it encompasses objects described as loci or probes. Genomic segments can range in size from points to regions as large as an entire chromosome. There are ...
Plural of segmentum.
Relating to a segment.
1. The act of dividing into segments; the state of being divided into segments. 2. SYN: cleavage (1).
Excision of an anatomic segment of any organ or gland.
A schizont; usually applied to the malaria parasite developing in a red blood cell after having undergone nuclear and cytoplasmic division, just before cell rupture and release ...
A genus of freshwater pulmonate snails (family Planorbidae, subfamily Segmentininae); includes the species S. hemisphaerula, an important intermediate host of Fasciolopsis ...
SYN: segment (1). [L. segment] - s. A1 arteriae cerebri anterioris precommunicating part of anterior cerebral artery. - s. A2 arteriae cerebri anterioris postcommunicating part of ...
1. Removal of certain parts from a mass, e.g., those with infectious diseases. 2. Separation of contrasting characters in the offspring of heterozygotes. 3. Separation of the ...
SYN: separator (2).
Erich, German ophthalmologist, 1882–1946. See S. scotoma, S. sign.
Pierre, French apothecary, 1660–1719. See S. salt.
Carl, Swiss laryngologist and anatomist in U.S., 1849–1905. See S. cartilage.
Martin, 20th century Scandinavian physician. See Lawrence-S. syndrome, S. syndrome.
Recording of cardiac vibrations as they affect the entire body, by various techniques. [G. seismos, a shaking, + cardiogram]
SYN: vibratory massage. [G. seismos, a shaking, vibration]
Uncontrolled electrical activity in the brain, which may produce a physical convulsion, minor physical signs, thought disturbances, or a combination of symptoms. The type of ...
Seizure disorders
One of a great many medical conditions that are characterized by episodes of uncontrolled electrical activity in the brain (seizures). Some seizure disorders are hereditary, but ...
Seizure, absence
A seizure that takes the form of a staring spell. The person suddenly seems to be “absent.” An absence seizure involves a brief loss of awareness, which can be accompanied by ...
Seizure, atonic
A seizure in which the person suddenly loses muscle tone and cannot sit or stand upright. Also called drop attacks or drop seizures.
Seizure, complex partial
A form of partial seizures during which the person does lose awareness. The patient does not actually become unconscious, and may carry out actions as complex as walking, ...
Seizure, febrile
A convulsion that occurs in association with a rapid increase in body temperature. Febrile seizures are common in infants and young children and, fortunately, are usually of no ...
Seizure, Jacksonian
A form of epilepsy involving brief alteration in movement, sensation or nerve function caused by abnormal electrical activity in a localized area of the brain. Seizures of this ...
Seizure, myoclonic
A seizure characterized by jerking (myoclonic) movements of a muscle or muscle group,
Seizure, partial
A seizure that affects only one part of the brain. Symptoms will depend on which part is affected: one part of the body, or multiple body parts confined to one side of the body, ...
Seizure, petit mal
A form of epilepsy with very brief, unannounced lapses in consciousness. A petit mal seizure involves a brief loss of awareness, which can be accompanied by blinking or mouth ...
Seizure, tonic-clonic
The most obvious type of seizure. There are two parts to a tonic-clonic seizure. In the tonic phase the body becomes rigid, and in the clonic phase there is uncontrolled jerking. ...
Rarely used term for a morbid fear of a flash of light. [G. selas, light, + phobos, fear]
Sven Ivar, Swedish radiologist, *1921. See S. technique.
A cell surface molecule involved in immune adhesion and cell trafficking. [L. se-ligo, pp. se-lectum, to sort, choose, + -in] - E s. cell surface receptor produced by ...
The combined effect of the causes and consequences of genetic factors that determine the average number of progeny of a species that attain sexual maturity; phenotypes that are ...
Selective Estrogen-Receptor Modulator (SERM)
A "designer estrogen" which possesses some, but not all, of the actions of estrogen. For example, raloxifene (trade name EVISTA) is classified as a SERM because it ...
Selective mutism
An inability to speak in certain situations. See also apraxia, autism, mutism.
Selective tubal occlusion procedure
(The acronym for selective tubal occlusion procedure is STOP.) A nonsurgical form of permanent birth control in which a physician inserts a 4-centimeter (1.6 inch) long metal ...

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