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Слова на букву post-retr (2629)

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rationalization
A postulated psychoanalytic defense mechanism through which irrational behavior, motives, or feelings are made to appear reasonable. [L. ratio, reason]
Ratner
See Kurzrok-R. test.
ratsbane
SYN: arsenic.
rattlesnake
A member of the crotalid genera Crotalus and Sistrurus, characterized by possession of cuticular warning rattles at the tip of the tail.
Rattlesnake bite
A poisonous bite by a member of the pit viper family. All rattlesnakes are venomous and secrete poisonous venom. Rattlesnakes are the main cause of death from snake bites in ...
Rattus
The rats, a genus of rodents, family Muridae. R. r., the black r., is the species most commonly responsible for transmitting plague to humans by means of the flea, Xenopsylla ...
Rau, Ravius, Raw
Johann J., Dutch anatomist, 1668–1719. See R. process, processus ravii.
Rauber
August A., German anatomist, 1841–1917. See R. layer.
Rauscher
Frank J., 20th century U.S. oncologist. See R. virus.
Rauwolfia
A genus of tropical trees and shrubs (family Apocynaceae). The powdered whole root of R. serpentina contains alkaloids that produce a sedative-antihypertensive-bradycardiac ...
RAV
Abbreviation for Rous-associated virus.
Ravius
See Rau.
ray
1. A beam of light, heat, or other form of radiation. The rays from radium and other radioactive substances are produced by a spontaneous disintegration of the atom; they are ...
Rayer
Pierre F., French physician, 1793–1867. See R. disease.
rayl
Unit of acoustic impedance. 1 r. = 1 kg × m−2 × sec−1. [ Baron Rayleigh (John W. Strutt), Eng. physicist]
Rayleigh
Lord John William Strutt, British physicist and Nobel laureate, 1842–1919. See R. equation, R. test.
Raynaud
Maurice, French physician, 1834–1881. See R. syndrome, R. disease, R. phenomenon, R. sign.
Raynaud disease
A condition resulting in skin discoloration of the fingers and/or toes when a person is exposed to changes in temperature (cold or hot) or to emotional events. This condition can ...
Raynaud's phenomenon
A condition resulting in discoloration of fingers and/or toes when a person is exposed to changes in temperature (cold or hot) or emotional events. The skin discoloration occurs ...
Rb
Symbol for rubidium.
RBC
Short for red blood cells, the cells that carry oxygen and carbon dioxide through the blood. This rather remarkable feat is thanks to hemoglobin, the pigment that makes red cells ...
rbc, RBC
Abbreviation for red blood cell; red blood count.
RBE
Abbreviation used in radiation protection for relative biologic effectiveness; Cf. quality factor, QF.
RBF
Abbreviation for renal blood flow. See effective renal blood flow.
RCT
Abbreviation for randomized controlled trial.
RDA
Abbreviation for recommended daily allowance.
RDAs (Recommended Dietary Allowances)
A set of estimated nutrient allowances established by the National Academy of Sciences. It is updated periodically to reflect current scientific knowledge.
RDFS
Abbreviation for ratio of decayed and filled surfaces.
RDFT
Abbreviation for ratio of decayed and filled teeth.
RDIs (Reference Daily Intakes)
A set of dietary references based on the Recommended Dietary Allowances for essential vitamins and minerals and, in selected groups, protein. The name "RDI" replaces the term ...
RDPA
Abbreviation for right descending pulmonary artery.
Re
Symbol for rhenium.
re-
Prefix meaning again or backward. [L.]
Reabsorption
Absorbing again. For example, the kidney selectively reabsorbs substances such as glucose, proteins, and sodium which it had already secreted into the renal tubules. These ...
react
To take part in or to undergo a chemical reaction. [Mod. L. reactus]
reactance
The weakening of an alternating electric current by passage through a coil of wire or a condenser. SYN: inductive resistance.
reactant
A substance taking part in a chemical reaction. - acute phase reactants a group of proteins that are produced and/or released in increased concentrations during the acute phase ...
reaction
1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with ...
Reaction kinetics
Kinetics (with an "s" at the end) refers to the rate of change in a biochemical (or other) reaction, the study of reaction rates. Kinetics is a noun. It is distinct from " ...
Reaction, allergic
A reaction that occurs when the immune system attacks a usually harmless substance (an allergen) that gains access to the body. The immune system calls upon a protective ...
Reaction, chemical
A process in which one substance is transformed into another. Thousands of different types of chemical reactions occur in the body and are essential to its structure and function.
Reaction, desmoplastic
This term refers to the growth of fibrous or connective tissue. Some tumors elicit a desmoplastic reaction, the pervasive growth of dense fibrous tissue around the tumor. Scar ...
Reaction, hibernation
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 ...
Reaction, polymerase chain (PCR)
A key technique in molecular genetics that permits the analysis of any short sequence of DNA (or RNA) without having to clone it. PCR is used to amplify selected sections of ...
Reaction, vasovagal
A reflex of the involuntary nervous system called the vasovagal reaction. The vasovagal reaction leads the heart to slow down (bradycardia) and, at the same time, it effects the ...
reactivate
1. To render active again. 2. In particular, of an inactivated immune serum to which normal serum (complement) is added.
reactivation
1. Restoration of the lytic activity of an inactivated serum by means of the addition of complement. 2. Restoration of activity in an inactivated enzyme.
Reactive arthritis
A chronic form of arthritis featuring the following three conditions: (1) inflamed joints; (2) inflammation of the eyes (conjunctivitis); and (3) inflammation of the genital, ...
reactivity
1. The property of reacting, chemically or in any other sense. 2. The process of reacting.
reading
1. The perception and understanding of the meaning of visual symbols ( e.g., letters or words) by the scanning of writing or print with the eyes. 2. Any of several alternative ...
Reading frame
One of the three possible ways to read a nucleotide sequence in DNA (depending upon whether reading starts with the first, second or third base in a triplet). * * * The grouping ...
Reading frame, open
An open reading frame in DNA has no termination codon, no signal to stop reading the nucleotide sequence, and so may be translated into protein.
Reading retardation
Reading retardation means impaired ability to read. Reading retardation is an impairment that may, for example, reflect mental retardation or cultural deprivation. Reading ...
readthrough
In molecular biology, transcription of a nucleic acid sequence beyond its normal termination sequence.
Reagent
A substance used to produce a chemical reaction to detect, measure, produce, etc. other substances. * * * Any substance added to a solution of another substance to participate in ...
reagin
1. Wolff-Eisner term for antibody. 2. Old term for the “Wassermann” antibody; not to be confused with the Prausnitz-Küstner antibody. 3. Antibodies that mediate immediate ...
reaginic
Pertaining to a reagin.
REAL
Abbreviation for Revised European-American Classification of Lymphoid Neoplasms. See R. classification.
reality
That which exists objectively and in fact, and can be consensually validated. [L. res, thing, fact]
reality awareness
The ability to distinguish external objects as being different from oneself.
reamer
A rotating finishing or drilling tool used to shape or enlarge a hole in bone or a tooth. [A.S. ryman, to widen] - engine r. an engine-mounted spirally bladed instrument, used for ...
rearrangement
A restructuring; E.G., in a molecule. - Amadori r. a r. that occurs in cross-linking reactions seen in collagen and in protein glycosylations; E.G., conversion of N-glycosides of ...
reassignment
sex r. a process whereby the sex of an individual is changed by a combination of psychiatric, psychologic, pharmacologic, and surgical procedures, usually as a part of the ...
reattachment
New epithelial or connective tissue attachment to the surface of a tooth that was surgically detached and not exposed to oral environment.
Réaumur
René A.F. de, French physicist, 1683–1757. See R. scale.
rebase
In dentistry, to refit a denture by replacing the denture base material without changing the occlusal relationship of the teeth. SEE ALSO: reline.
Rebound
Return of the original symptoms when maneuvers or treatment is discontinued.
Rebound effect
The characteristic of a drug to produce reverse effects when the effect of the drug has passed or the patient no longer responds to it.
rebreathing
Inhalation of part or all of gases previously exhaled.
Rebuck skin window technique
See under technique.
RecA
An Escherichia coli protein that specifically recognizes single-stranded DNA and anneals it to a complementary sequence in a duplex that is homologous. This results in the ...
recalcification
Restoration to the tissues of lost calcium salts.
Recalcitrant
Stubborn. For example, a recalcitrant case of pneumonia stubbornly resists treatment.
recall
The process of remembering thoughts, words, and actions of a past event in an attempt to recapture actual happenings.
Récamier
Joseph C.A., French gynecologist, 1774–1852. See R. operation.
recanalization
1. Restoration of a lumen in a blood vessel following thrombotic occlusion, by organization of the thrombus with formation of new channels. 2. Spontaneous restoration of the ...
recapitulation
See r. theory.
receiver
In chemistry, a vessel attached to a condenser to receive the product of distillation. [L. receptor, fr. recipio, to receive]
Recent memory
Short-term memory. Also called working memory. Recent memory is a system for temporarily storing and managing the information required to carry out complex cognitive tasks such ...
receptaculum
A receptacle. SYN: reservoir. [L. fr. re-cipio, pp. -ceptus, to receive, fr. capio, to take] - r. chyli SYN: cisterna chyli. - r. ganglii petrosi SYN: petrosal fossula. - r. ...
receptive
Sensitive or responsive to stimulus. - r. field that part of the retina of which the photoreceptors (rods and cones) pertain to a single optic nerve fiber. The response of a ...
Receptor
In cell biology, a structure on the surface of a cell (or inside a cell) that selectively receives and binds a specific substance. There are hoards of receptors. There are ...
Receptor, chemokine
A molecule that receives a chemokine and a chemokine dock. A chemokine is a protein that acts as a lure. Chemokines are involved in inflammation, cancer, and infectious ...
Receptor, T-cell
A molecule on the surface of T-lymphocytes (T-cells) for recognizing specific antigens (foreign substances or microbes such as viruses).
Receptor, visual
The layer of rods and cones, the visual cells, of the retina.
receptosomes
Vesicles that avoid lysosomes and deliver their contents to other intracellular sites.
recess
A small hollow or indentation. SYN: recessus [TA]. [L. recessus] - anterior r. a circumscript deepening of the interpeduncular fossa in the direction of the mamillary bodies. ...
recession
A withdrawal or retreating. SEE ALSO: retraction. [L. recessio (see recessus)] - angle r. tearing of the iris root between the longitudinal and circular ciliary muscles; often ...
recessitivity
The state of being recessive (2).
Recessive
A trait that is evident only when one copy of the gene for it is inherited from each of the parents. * * * 1. Drawing away; receding. 2. In genetics, denoting a trait due to a ...
Recessive, autosomal
A genetic condition that appears only in individuals who have received two copies of an autosomal gene, one copy from each parent. The gene is on an autosome, a nonsex ...
Recessive, X-linked
A gene on the X chromosome that expresses itself only when there is no different gene present at that locus (spot on the chromosome). For example, Duchenne muscular dystrophy ...
recessus
SYN: recess. [L. a withdrawing, a receding] - r. anterior [TA] SYN: anterior recess. - r. anterior membranae tympanicae [TA] SYN: anterior recess of tympanic membrane. - r. ...
recidivation
Relapse of a disease, a symptom, or a behavioral pattern such as an illegal activity for which one was previously imprisoned. [L. recidivus, falling back, recurring, fr. re- ...
recidivism
The tendency of an individual toward recidivation. [L. recidivus, recurring]
recidivist
A person who tends toward recidivation.
recipe
1. The superscription of a prescription, usually indicated by the sign ℞. 2. A prescription or formula. [L. imperative recipio, to receive]
Recipient
In medicine, a recipient is someone who receives something like a blood transfusion or an organ transplant. The recipient is beholden to the donor. * * * One who receives, as in ...
recipiomotor
Relating to the reception of motor stimuli. [L. recipio, to receive, + motor, mover]
Reciprocal translocation
A type of chromosome rearrangement involving the exchange of chromosome segments between two chromosomes that do not belong to the same pair of chromosomes. A specific reciprocal ...
reciprocation
In prosthodontics, the means by which one part of an appliance is made to counter the effect created by another part. [L. reciprocare, pp. reciprocatus, to move back and forth]
recirculation
Circular movement of the mucus blanket in a paranasal sinus due to the presence of an accessory ostium or failure to include the natural ostium in sinusotomy.
Recklinghausen
Friedrich D. von, German histologist and pathologist, 1833–1910. See R. disease of bone, von R. disease.
reclination
Turning the cataractous lens over into the vitreous to displace it from the line of vision; distinguished from couching, in which the lens is simply depressed into the ...
recollection
In renal physiology, a technique in which a known fluid is infused into a renal tubule lumen at one point and collected for analysis by a second micropipette further downstream. ...
Recombinant
A person with a new combination of genes, a combination of genes not present in either parent, due to parental recombination of those genes. * * * 1. A cell or organism that has ...
Recombinant clones
Clones containing recombinant DNA molecules.
Recombinant DNA Advisory Committee (RAC)
The National Institutes of Health (NIH) panel that oversees gene-therapy research in the U.S.
Recombinant DNA molecules
A combination of DNA molecules of different origin that are joined using recombinant DNA technology.
Recombinant DNA technology
A series of procedures used to join together (recombine) DNA segments. A recombinant DNA molecule is constructed (recombined) from segments from 2 or more different DNA ...
Recombination
The trading of fragments of genetic material between chromosomes before the egg and sperm cells are created. Key features of recombination include the point-to-point association ...
RECOMBIVAX-HB
A vaccine against hepatitis B (hep B) to stimulate the body’s immune system to produce antibodies against the hep B virus.
recon
Obsolete term for the smallest unit (corresponding to a single DNA nucleotide) of recombination or crossing-over between two homologous chromosomes.
reconstitution
1. The restitution or return to an original state of a substance, or combination of parts to make a whole. 2. In the case of a lower organism, the restoration of a part of the ...
reconstruction
The computerized synthesis of one or more two-dimensional images from a series of x-ray projections in computed tomography, or from a large number of measurements in magnetic ...
record
1. In medicine, a chronologic written account that includes a patient's initial complaint(s) and medical history, physical findings, results of diagnostic tests and procedures, ...
recording
Preserving the results of a study. - clinical r. SYN: charting. - depth r. study of subcortical cerebral electrical activity after placing electrodes in these areas.
recovery
1. A getting back or regaining; recuperation. 2. Emergence from general anesthesia. 3. In nuclear magnetic resonance, refers to relaxation. [M.E., fr. O.Fr. recoverer, fr. L. ...
recovery room
A hospital facility with special equipment and personnel for the immediate postoperative care of patients as they recover from anesthesia and/or surgery.
Recrudescence
Reappearance of a disease after it has been quiescent. A new outbreak or the return of a disease. As, for example, the recrudescence of a pansinusitis (sinusitis, an infection ...
recrudescent
Becoming active again, relating to a recrudescence.
recruitment
1. In the testing of hearing, the abnormally greater increase in loudness in response to increments in intensity of the acoustic stimulus in an ear with a sensory hearing loss ...
rect-
See recto-.
rectal
Relating to the rectum.
Rectal (adjective)
Having to do with the rectum, the last 6 to 8 inches of the large intestine that serves to store solid waste until it leaves the body through the anus. The word "rectal" comes ...
Rectal (noun)
An informal term for a digital rectal exam (DRE) done to detect abnormalities that can be felt (palpated) from within the rectum. The doctor inserts a lubricated, gloved finger ...
Rectal exam, digital (DRE)
An exam done to detect abnormalities that can be felt (palpated) from within the rectum. The doctor inserts a lubricated, gloved finger into the rectum and feels for anything that ...
Rectal incontinence
Inability to hold feces in the rectum due to failure of voluntary control over the anal sphincters with involuntary passage of feces and gas. Also called fecal incontinence.
rectalgia
SYN: proctalgia.
rectectomy
SYN: proctectomy.
rectifier
An electronic device for converting alternating to direct voltage, part of the circuit of an x-ray machine. [Mediev. L. rectifico, to make right, fr. rectus, right + facio to ...
rectify
1. To correct. 2. To purify or refine by distillation; usually implies repeated distillations. [L. rectus, right, straight]
rectitis
SYN: proctitis.
recto-, rect-
The rectum. SEE ALSO: procto-. [L. rectum, fr. rectus, straight]
rectoabdominal
Relating to the rectum and the abdomen; denoting a bimanual method of examination with one hand on the abdominal wall and a finger of the other hand in the rectum.
rectocele
SYN: proctocele. [recto- + G. kele, tumor, hernia]
rectoclysis
SYN: proctoclysis.
rectococcygeal
Relating to the rectum and the coccyx.
rectococcypexy
SYN: proctococcypexy.
rectocolitis
SYN: coloproctitis.
rectoperineal
Relating to the rectum and perineum.
rectoperineorrhaphy
SYN: proctoperineoplasty. [recto- + perineo- + G. rhaphe, a sewing]
rectopexy
SYN: proctopexy.
rectophobia
SYN: proctophobia. [recto- + G. phobos, fear]
rectoplasty
SYN: proctoplasty.
rectorrhaphy
SYN: proctorrhaphy.
rectoscope
SYN: proctoscope.
rectoscopy
SYN: proctoscopy.
rectosigmoid
The rectum and sigmoid colon considered as a unit; the term is also applied to the junction of the sigmoid colon and rectum.
rectostenosis
SYN: proctostenosis.
rectostomy
SYN: proctostomy.
rectotome
SYN: proctotome.
rectotomy
SYN: proctotomy.
rectourethral
Relating to the rectum and the urethra.
rectouterine
Relating to the rectum and the uterus.
Rectouterine pouch
An extension of the peritoneal cavity between the rectum and back wall of the uterus. The term " cul-de-sac," aside from being any "blind pouch or cavity that is closed at one ...
rectovaginal
Relating to the rectum and the vagina.
rectovesical
Relating to the rectum and the bladder.
rectovestibular
Relating to the rectum and the vestibule of the vagina.
Rectum
: The last 6 to 8 inches of the large intestine. The rectum stores solid waste until it leaves the body through the anus. The word rectum comes from the Latin rectus meaning ...
Rectus
Usually refers to the rectus abdominis, a large muscle in the front of the abdomen that assists in the regular breathing movement and supports the muscles of the spine while ...
Rectus abdominis
A large muscle in the front of the abdomen that assists in the regular breathing movement and supports the muscles of the spine while lifting and keeping abdominal organs such as ...
recumbent
Leaning; reclining; lying down. [L. recumbo, to lie back, recline, fr. re-, back, + cubo, to lie]
Recuperate
To recover health and strength. From the Latin recuperare meaning to regain, get back, recover. To recuperate is to convalesce. * * * To undergo recuperation. [L. recupero (or ...
recuperation
Recovery of or restoration to the normal state of health and function. [L. recuperatio (see recuperate)]
Recur
: To occur again. To return. Any symptom (such as fatigue), any sign (such as a heart murmur), or any disease can recur.
recurrence
1. A return of the symptoms, occurring as a phenomenon in the natural history of the disease, as seen in recurrent fever. 2. SYN: relapse. 3. Appearance of a genetic trait in a ...
Recurrence risk
In medical genetics, the recurrence risk is the chance that a genetic (inherited) disease present in the family will recur in that family and affect another person (or persons). ...
Recurrent
Back again. A recurrent fever is a fever that has returned after an intermission: a recrudescent fever. * * * 1. In anatomy, turning back on itself. 2. Denoting symptoms or ...
Recurrent abortion
The occurrence of 3 or more miscarriages (which are medically termed "spontaneous abortions") with no intervening pregnancies. Recurrent abortion (or, as it is sometimes called, ...
Recurrent aural vertigo
A condition, also known as Meniere's disease, with recurrent vertigo accompanied by ringing in the ears (tinnitus) and deafness. Symptoms include vertigo, dizziness, nausea, ...
Recurrent laryngeal nerve
One of the best known branches of the vagus nerve, a very long nerve that originates in the brainstem. After the recurrent laryngeal nerve leaves the vagus nerve, it goes down ...
Recurrent respiratory papillomatosis
Recurrent respiratory papillomatosis involves the growth of numerous warty growths in the larynx on the vocal cords in children and young adults. A baby can contract recurrent ...
recurvation
A backward bending or flexure. [L. re-curvus, bent back]
red
One of the primary colors, occupying the lower extremity of the spectrum at the other end from violet. For individual r. dyes, see specific name. [A.S. reád]
Red blood cell
One of the blood cells that carry oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide). Hemoglobin, aside ...
Red blood cells
The blood cells that carry oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide). Hemoglobin, aside from being ...
Red cell count
The number of red blood cells (RBCs) in a volume of blood. The normal range varies slightly between laboratories but is generally between 4.2 - 5.9 million cells/cmm. This can ...
Red cell distribution width
A measurement of the variability of red blood cell size. Higher numbers indicate greater variation in size. The normal range for the red cell distribution width (RDW) is 11 - ...
Red cells
Short for red blood cells, the oxygen/carbon dioxide carrying cells in blood. Also known acronymically as RBC’s, red corpuscles or erythrocytes (literally, red hollow ...
Red corpuscles
Red corpuscles are cells that carry oxygen in the blood. They are also called red blood cells or "RBCs."
Red Cross
A red Geneva cross on a white background, an international sign to identify medical and other personnel caring for the sick and wounded and facilities devoted to their care in ...
Red eye
Also called conjunctivitis. Redness or irritation of the conjuctivae, the membranes on the inner part of the eyelids and the membranes covering the whites of the eyes. These ...
Red-green colorblindness
A form of colorblindness in which red and green are perceived as identical. This is the most common type of colorblindness. It is also known as deuteranomaly, deuteranopia, ...
redia
Intramolluscan development stage of a digenetic trematode, following the primary sporocyst stage, which forms after penetration of the snail tissues by the miracidium. Rediae ...
redifferentiation
The return to a fully specialized condition for the performance of a particular function after a period of nonspecific activity.
redintegration
1. The restoration of lost or injured parts. 2. Restoration to health. 3. The recalling of a whole experience on the basis only of some item or portion of the original stimulus ...
Redlich
Emil, Austrian neurologist, 1866–1930. See Obersteiner-R. line, Obersteiner-R. zone.
redox
Contraction of oxidation-reduction. See oxidation-reduction potential.
redressement forcé
Obsolete term for straightening by force of a deformed part, as of knock-knee. [Fr.]
redressment
1. Obsolete term for correction of a deformity; putting a part straight. 2. A renewed dressing of a wound.
reduce
1. To place back into a preferred position; to perform reduction (1). 2. In chemistry, to initiate reduction (2). [L. re-duco, to lead back, restore, r.]
reducible
Capable of being reduced.
reductant
The substance that is oxidized in the course of reduction.
reductase
An enzyme that catalyzes a reduction; since all enzymes catalyze reactions in either direction, any r. can, under the proper conditions, behave as an oxidase and vice versa, hence ...
reductic acid
A strong reducing product ( antioxidant) formed in hot alkaline sugar solutions.
reduction
1. The restoration, by surgical or manipulative procedures, of a part to its normal anatomic relation. SYN: repositioning (2). 2. In chemistry, a reaction involving a gain of one ...
Reduction division
The first cell division in meiosis, the process by which germ cells are formed. A unique event in which the chromosome number is reduced from diploid (46 chromosomes) to haploid ...
redundancy
Occurrence of linearly arranged, largely identical, repeated sequences of DNA. - terminal r. the condition in a viral chromosome in which identical genetic information occurs at ...
reduplication
1. A redoubling. 2. A duplication or doubling, as of the sounds of the heart in certain morbid states or the presence of two instead of a normally single part. 3. A fold or ...
reduvid, reduviid
A member of the family Reduviidae.
Reduviid bug
The insect that carries and transmits the parasite Trypanosoma cruzi that is the cause of Chagas disease (American trypanosomiasis). The bug is also called the kissing bug ...
Reduviidae
A family (order Hemiptera) of predatory insects, the assassin bugs, which attack animals and humans. It includes the subfamily Triatominae, the kissing or cone-nosed bugs, ...
Reed
Dorothy M., U.S. pathologist, 1874–1964. See R. cell, R.- Sternberg cell, Sternberg-R. cell. Walter, 1851–1902. U.S. Army surgeon, elucidated epidemiology of yellow fever. ...
Reed-Sternberg cell
A type of cell that appears in patients with Hodgkin's disease. The number of these cells increases as the disease advances.
reefing
Surgically reducing the extent of a tissue by folding it and securing with sutures, as in plication. - stomach r. SYN: gastroplication.
reenactment
In psychodrama, the acting out of a past experience.
reentry
Return of the same impulse into a zone of heart muscle that it has recently activated, sufficiently delayed that the zone is no longer refractory, as seen in most ectopic beats, ...
Rees
H. Maynard, 20th century U.S. physician. See R.- Ecker fluid.
Reese
Algernon B., U.S. ophthalmologist, 1896–1981. See Cogan-R. syndrome.
refect
To induce refection.
refection
A restoring to the normal state. [L. refectio, fr. reficere, to restore, fr. re- + facio, to do]
Referral
The recommendation of a medical or paramedical professional. If you get a referral to ophthalmology, for example, you are being sent to the eye doctor. In HMOs and other ...
Refetoff
S., 20th century U.S. endocrinologist. See R. syndrome.
refine
To free from impurities.
reflect
1. To bend back. 2. To throw back, as of radiant energy from a surface. 3. To meditate; to think over a matter. 4. To send back a motor impulse in response to a sensory ...
reflectance
A measure of reflected acoustic energy as a function of immitance, as in middle ear impedance.
reflection
1. The act of reflecting. 2. That which is reflected. 3. In psychotherapy, a technique in which a patient's statements are repeated, restated, or rephrased in order that the ...
reflector
Any surface that reflects light, heat, or sound.
Reflex
A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in ...
Reflex sympathetic dystrophy (RSD)
A condition characterized by diffuse pain, swelling and limitation of movement that follows a injury such as a fracture in an arm or leg, The symptoms are way out of proportion to ...
Reflex sympathetic dystrophy syndrome (RSDS)
A condition that features a group of typical symptoms, including pain (often "burning" type), tenderness, and swelling of an extremity associated with varying degrees ...
Reflex, Babinski
An important neurologic test based, believe it or not, upon what the big toe does when the sole of the foot is stimulated. If the big toe goes up, that may mean trouble. The ...
Reflex, let down
The let down reflex of the mother is an involuntary reflex during breastfeeding which causes the milk to flow freely.
Reflex, photic sneeze
A disorder, also known as the achoo syndrome, characterized by nearly uncontrollable paroxysms of sneezing provoked in a reflex fashion by the sudden exposure of a dark-adapted ...
Reflex, pressor
A pressor reflex is a neurological (nerve) reflex that constricts arterioles (small blood vessels) and thereby increases the blood pressure. "Pressor" refers to raising the blood ...
reflexogenic
Causing a reflex. SYN: reflexogenous.
reflexogenous
SYN: reflexogenic.
reflexograph
An instrument for graphically recording a reflex. [reflex + G. grapho, to write]
reflexology
The study of reflexes. [reflex + G. logos, study]
reflexometer
An instrument for measuring the force necessary to excite a reflex. [reflex + G. metron, measure]
reflexophil, reflexophile
Having exaggerated reflexes. [reflex + G. phileo, to love]
reflexotherapy
SYN: reflex therapy.
Reflux
: The term used when liquid backs up into the esophagus from the stomach. * * * 1. A backward flow. SEE ALSO: regurgitation. 2. In chemistry, to boil without loss of vapor ...
reformat
In computed tomography, when data from a series of contiguous transverse scan images are recombined to produce images in a different plane, such as sagittal or coronal.
Refract
In ophthalmology, to determine the bending of light that takes place within the human eye. Refractive errors include nearsightedness (myopia), farsightedness (hyperopia), and ...
refractable
Subject to refraction. SYN: refrangible.
Refraction
In ophthalmology, the bending of light that takes place within the human eye. Refractive errors include nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. ...
refractionist
A person trained to measure the refraction of the eye and to determine the proper corrective lenses.
refractionometer
SYN: refractometer.
refractive
1. Pertaining to refraction. 2. Having the power to refract. SYN: refringent.
refractivity
Refractive power. SYN: refringency.
refractometer
An instrument for measuring the degree of refraction in translucent substances, especially the ocular media. See refractive index. SYN: objective optometer, ...
refractometry
1. Measurement of the refractive index. 2. Use of a refractometer to determine the refractive error of the eye.
Refractory
Not yielding (at least not yielding readily) to treatment. * * * 1. Resistant to treatment, as of a disease. SYN: intractable (1), obstinate (2). 2. SYN: obstinate (1). [L. ...
refracture
Breaking a bone that has united after a previous fracture with the new fracture occurring at or near the previous fracture site. [re- + fracture]
refrangible
SYN: refractable. [L. refringo, to break in pieces]
refresh
1. To renew; to cause to recuperate. 2. To perform revivification (2). [O. Fr. re-frescher]
refrigerant
1. Cooling; reducing slight fever. 2. An agent that gives a sensation of coolness or relieves feverishness. [L. re-frigero, pp. -atus, pr. p. -ans, to make cold, fr. frigus ...
refrigeration
The act of cooling or reducing fever. [L. refrigeratio (see refrigerant)]
refringence
SYN: refraction.
refringency
SYN: refractivity.
refringent
SYN: refractive.
Refsum
Sigvald, Norwegian neurologist, *1907. See R. disease, R. syndrome.
Refsum’s disease
A genetic disorder affecting metabolism of the fatty acid phytanic acid. When phytanic acid accumulates, it causes a number of progressive problems, including inflammation of ...
refusion
Return of the circulation of blood which has been temporarily cut off by ligature of a limb. [L. re-fundo, pp. -fusus, to pour back]
regainer
An appliance used in an attempt to regain space in the dental arches.
Regaud
Claude, French radiologist, 1870–1940. See R. fixative, residual body of R..
Regenerate
To reproduce or renew something lost. For example, after an injury, the liver has the capacity to regenerate. * * * To renew; to reproduce. [L. re- genero, pp. -atus, to ...
regeneration
1. Reproduction or reconstitution of a lost or injured part. SYN: neogenesis. 2. A form of asexual reproduction; e.g., when a worm is divided into two or more parts, each ...
Regimen
With the accent on the first syllable (reg as in Reggie Jackson), a regimen is a plan, a regulated course such as a diet, exercise or treatment, designed to give a good result. A ...
regio
SYN: region. [L.] - regiones abdominis [TA] SYN: abdominal regions, under region. - r. abdominis lateralis flank. - r. analis [TA] SYN: anal triangle. - r. antebrachialis ...
region
1. An often arbitrarily limited portion of the surface of the body. SEE ALSO: space, zone. 2. A portion of the body having a special nervous or vascular supply, or a part of an ...
Region, regulatory
A region of a chromosome that controls gene expression. In terms of DNA, it is a regulatory sequence.
regional
Relating to a region.

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