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Regional enteritis
Crohn’s disease, a chronic inflammatory disease of the intestine primarily in the small and large intestines but which can occur anywhere in the digestive system between the ...
Regional lymphadenitis
Cat scratch disease, a mild flu-like infection, with swollen lymph nodes (lymphadenitis) and mild fever of short duration, due to cat scratches, especially from kittens. There is ...
regiones
Plural of regio. [L.]
register
The file of data concerning all cases of a specified condition, such as cancer, occurring in a defined population; the r. is the actual document, and the registry is the system ...
registration
In dentistry, a record. - maxillomandibular r. SYN: maxillomandibular record. - tissue r. in dentistry, 1. the accurate r. of the shape of tissues under any condition by means ...
Registry
Although a registry was originally the place (like Registry House in Edinburgh) where information was collected (in registers), the word registry has also come to mean the ...
Registry, tumor
Recorded information about the status of patients with tumors. Although a registry was originally the place (like Registry House in Edinburgh) where information was collected ...
regnancy
The briefest unit of experience; the unit composed of the total physiologic processes occurring at a single moment, which constitute dominant configurations in the brain. A ...
Regress
To return or go back, particularly to return to a pattern of behavior or level of skill characteristic of a younger age. For example, if a three-year-old child begins to regress ...
regression
1. A subsidence of symptoms. 2. A relapse; a return of symptoms. 3. Any retrograde movement or action. 4. A return to a more primitive mode of behavior due to an inability to ...
regressive
Relating to or characterized by regression.
regulation
1. Control of the rate or manner in which a process progresses or a product is formed. 2. In experimental embryology, the power of a pregastrula embryo to continue approximately ...
regulator
A substance or process that controls another substance or process. - growth regulators substances that can alter the growth of a living organism. - humoral r. a substance whose ...
Regulatory gene
A gene that regulates the expression of other genes. A regulatory gene is a nosy gene whose prime preoccupation is to horn in on other genes and control the rate at which they ...
Regulatory region
A region of a chromosome that controls gene expression. In terms of DNA, it is a regulatory sequence.
Regulatory sequence
A sequence of bases in DNA that controls gene expression.
regulon
A set of structural genes, all with the same gene regulation, whose gene products are involved in the same reaction pathway.
regurgitant
Regurgitating; flowing backward.
regurgitate
1. To flow backward. 2. To expel the contents of the stomach in small amounts, short of vomiting. [L. re-, back, + gurgito, pp. -atus, to flood, fr. gurges (gurgit-), a ...
Regurgitation
A backward flowing. For example, of food. Or the sloshing of blood back into the heart (or between chambers of the heart) when a heart valve is incompetent and does not close ...
Regurgitation, aortic
Sloshing of blood back down from the aorta into the left ventricle of the heart due to incompetency of the aortic valve. Also called aortic insufficiency.
Rehab
Short for Rehabilitation.
Rehabilitation
The restoration of skills by a person who has had an illness or injury so they regain maximum self-sufficiency and can function in a normal or as near normal manner as possible. ...
rehearsal
A process associated with enhancing short-term and long-term memory wherein newly presented information, such as a name or a list of words, is repeated to oneself one or more ...
Rehfuss
Martin E., U.S. physician, 1887–1964. See R. method, R. stomach tube.
Rehydrate
To restore lost water to the body tissues and fluids. Prompt rehydration is imperative whenever dehydration occurs, from diarrhea, exposure, lack of drinking water, or ...
rehydration
The return of water to a system after its loss.
Reichel
Friedrich P., German gynecologist and surgeon, 1858–1934. See R.- Pólya stomach procedure.
Reichert
Karl B., German anatomist, 1811–1883. See R. cartilage, R. cochlear recess, R.-Meissl number.
Reid
Robert W., Scottish anatomist, 1851–1939. See R. base line.
Reifenstein
Edward C. Jr., U.S. endocrinologist, 1908–1975. See R. syndrome.
Reil
Johann C., German physician, neurologist, and histologist, 1759–1813. See R. ansa, R. band, R. ribbon, R. triangle, limiting sulcus of R., circular sulcus of R., island of ...
reimplantation
SYN: replantation. - extravesical r. SYN: detrusorrhaphy. - ureteral r. SYN: ureteroneocystostomy.
reinfection
A second infection by the same microorganism, after recovery from or during the course of a primary infection.
reinforcement
1. An increase of force or strength; denoting specifically the increased sharpness of the patellar reflex when the patient at the same time closes the fist tightly or pulls ...
reinforcer
In conditioning, a pleasant or satisfaction-yielding (positive r.) or painful or unsatisfying (negative r.), stimulus, object, or stimulus event that is obtained upon the ...
Reinke
Friedrich B., German anatomist, 1862–1919. See R. crystalloids, under crystalloid.
reinnervation
Restoration of nerve control of a paralyzed muscle or other effector organ by means of regrowth of nerve fibers, either spontaneously or after anastomosis.
reinoculation
Reinfection by means of inoculation.
Reinsch
Adolf, German physician, 1862–1916. See R. test.
reintegration
In the mental health professions, the return to well-adjusted functioning following disturbances due to mental illness.
reinversion
The correction, spontaneous or operative, of an inversion, as of the uterus.
Reis
Heinrich Maria Wilhelm, German ophthalmologist, *1872. See R.-Bücklers corneal dystrophy. SEE ALSO: R.-Bücklers corneal dystrophy.
Reisseisen
Franz D., German anatomist, 1773–1828. See R. muscles, under muscle.
Reissner
Ernst, German anatomist, 1824–1878. See R. fiber, R. membrane.
Reitan
Ralph M., U.S. psychologist, *1922. See Halstead-R. battery.
Reiter
Hans, German bacteriologist, 1881–1969. See R. test, R. disease, R. syndrome, Fiessinger-Leroy-R. syndrome.
Reiter syndrome
A chronic form of inflammatory arthritis wherein the following three conditions are combined: (1) arthritis; (2) inflammation of the eyes (conjunctivitis); and (3) inflammation ...
Rejection
In transplantation biology, the refusal by the body to accept transplanted cells, tissues or organs. For example, a kidney transplanted may be rejected. * * * 1. The immunologic ...
rejuvenescence
A renewal of youth; return of a cell or tissue to a state in which it was in an earlier stage of existence. [L. re-, again, + juvenesco, to grow young, fr. juvenis, a youth]
Relapse
The return of signs and symptoms of a disease after the patient has enjoyed a remission. For example, a 51-year-old man had a cancer of the colon treated and went into remission ...
relapsing
Recurring; said of a disease or its manifestations that returns in a new attack after an interval of improvement.
relation
1. An association or connection between or among people or objects. SEE ALSO: relationship. 2. In dentistry, the mode of contact of teeth or the positional relationship of oral ...
relationship
The state of being related, associated, or connected. - dose-response r. r. in which a change in the amount, intensity, or duration of exposure is associated with a change in risk ...
relax
1. To loosen; to slacken. 2. To cause a movement of the bowels. [L. re-laxo, to loosen]
Relaxant
Something that relaxes, relieves, reduces tension. For example, a muscle relaxant is often administered during abdominal surgery to relax the diaphragm and keep it from moving ...
relaxation
1. Loosening, lengthening, or lessening of tension in a muscle. 2. In nuclear magnetic resonance, r. is the decay in magnetization of protons after the direction of the ...
Relaxin
A hormone produced during pregnancy that facilitates the birth process by causing a softening and lengthening of the cervix and the pubic symphysis (the place where the pubic ...
relearning
The process of regaining a skill or ability that has been partially or entirely lost; savings involved in r., as compared with original learning, give an index of the degree of ...
Release, carpal tunnel
A surgical procedure to relieve pressure exerted on the median nerve within the carpal tunnel (the carpal tunnel syndrome). The median nerve is pinched in the wrist as it passes ...
releasin
SYN: relaxin.
reliability
The degree of stability exhibited when a measurement is repeated under identical conditions. See correlation coefficient, r. coefficient. [M.E. relien, fr. O.Fr. relier, fr. L. ...
relief
1. Removal of pain or distress, physical or mental. 2. In dentistry, reduction or elimination of pressure from a specific area under a denture base. SEE ALSO: r. area, r. ...
relieve
To free wholly or partly from pain or discomfort, either physical or mental. [through O. Fr. fr. L. re-levo, to lift up, lighten]
reline
In dentistry, to resurface the tissue side of a denture with new base material to make it fit more accurately. SEE ALSO: rebase.
rem
In radiation, Roentgen equivalent for man, a roentgen (an international unit of X- or gamma-radiation) adjusted for the atomic makeup of the human body. In ophthalmology, rapid ...
REM sleep
REM sleep is the portion of sleep when there are rapid eye movements (REMs). Dreams occur during REM sleep. We typically have 3 to 5 periods of REM sleep per night. They occur at ...
Remak
Ernst J., German neurologist, 1848–1911. See R. reflex, R. sign. Robert, Polish-German anatomist and histologist, 1815–1865. See R. nuclear division, R. fibers, under fiber, ...
remediable
Curable. [L. remediabilis, fr. remedio, to cure]
remedial
Curative or acting as a remedy.
Remedy
Something that consistently helps treat or cure a disease. From the Latin "remedium" meaning that which heals again (and again). A remedy for a wound is also called a ...
remineralization
1. The return to the body or a local area of necessary mineral constituents lost through disease or dietary deficiencies; commonly used in referring to the content of calcium ...
reminiscence
In the psychology of learning, an improvement in recall, over that shown on the last trial, of incompletely learned material after an interval without practice. [L. ...
remission
1. Abatement or lessening in severity of the symptoms of a disease. 2. The period during which such abatement occurs. [L. remissio, fr. re-mitto, pp. -missus, to send back, ...
remit
To become less severe for a time without absolutely ceasing. [see remission]
remittence
A temporary amelioration, without actual cessation, of symptoms.
remittent
Characterized by temporary periods of abatement of the symptoms of a disease.
remnant
Something remaining, a residue or vestige. [O. Fr., fr. remaindre, to remain, fr. L. remaneo]
remodeling
1. A cyclic process by which bone maintains a dynamic steady state through sequential resorption and formation of a small amount of bone at the same site; unlike the process of ...
Remote telesurgery
Surgical procedures carried out at a great distance thanks to advances in robotic and computer technology and their applications to surgery. The first demonstration of ...
ren
SYN: kidney. [L.]
ren. sem.
Abbreviation for [L.] renovetur semel, shall be renewed (only) once.
Renal
Having to do with the kidney. From the Latin renes (the kidneys), which gave the French les reins which mean both the kidneys and the lower back. * * * SYN: nephric.
Renal aneurysm
An aneurysm involving the kidney.
Renal calculi
Kidney stones. A common cause of blood in the urine and pain in the abdomen, flank, or groin. Occurs in 1 in 20 people at some time in their life. Development of the stones is ...
Renal cancer
Malignancy of the kidney, the organ that is primarily responsible for the removal of metabolic waste products from the body. The types of kidney cancer in adults and children are ...
Renal capsule
: The fibrous connective tissue that surrounds each kidney.
Renal cell carcinoma
Cancer that develops in the lining of the renal tubules, which filter the blood and produce the urine. Also called renal cell cancer.
Renal osteodystrophy
A combination of bone disorders usually caused by chronic kidney failure (renal disease). Can also occur because of abnormal kidney functioning at birth (congenital). When the ...
Renal pelvis
: The area at the center of the kidney. Urine collects here and is funneled into the ureter.
Renal stone
A stone in the kidney (or lower down in the urinary tract). Also called a kidney stone. Renal stones are a common cause of blood in the urine and pain in the abdomen, flank, ...
Renal syndrome with hemorrhagic fever
A number of diseases characterized by an abrupt onset of high fever and chills, headache, cold and cough, and pain in the muscles, joints and abdomen with nausea and vomiting ...
Renal tubules
Small structures in the kidney that filter the blood and produce the urine.
renaturation
The conversion of a denatured and inactive macromolecule back to its natured and bioactive configuration.
renculus
1. SYN: cortical lobules of kidney, under lobule. 2. SYN: reniculus (2).
Rendu
Henri J.L.M., French physician, 1844–1902. See R.-Osler- Weber syndrome.
reni-
See reno-.
renicapsule
The capsule of the kidney. [ reni- + L. capsula, capsule]
renicardiac
SYN: cardiorenal. [ reni- + G. kardia, heart]
reniculus
1. SYN: cortical lobules of kidney, under lobule. 2. A lobe of the human fetal kidney and that of some lower animals in which fibrous septa subdivide the organ. SYN: renculus ...
reniform
SYN: nephroid.
renin
A term originally used for a pressor substance obtained from rabbits' kidneys, now an enzyme that converts angiotensinogen to angiotensin I. SYN: angiotensinogenase.
reniportal
1. Relating to the hilum of the kidney. 2. Relating to the portal, or venous capillary circulation in the kidney. [ reni- + L. porta, gate]
rennase
SYN: chymosin.
rennet
SYN: chymosin.
rennin
SYN: chymosin.
renninogen, rennogen
SYN: prochymosin. [ rennin + G. -gen, producing]
reno-, reni-
The kidney. SEE ALSO: nephro-. [L. ren]
renocutaneous
Relating to the kidneys and the skin. [reno- + L. cutis, skin]
renogastric
Relating to the kidneys and the stomach. [reno- + G. gaster, stomach]
renogenic
Originating in or from the kidney.
renogram
The assessment of renal function by external radiation detectors after the administration of a radiopharmaceutical that is filtered and excreted by the kidney. [reno- + G. ...
renography
Radiography of the kidney.
renointestinal
Relating to the kidneys and the intestine.
rest
1. Quiet; repose. [A.S. raest] 2. To repose; to cease from work. [A.S. raestan] 3. A group of cells or a portion of fetal tissue that has become displaced and lies embedded in ...
restenosis
Recurrence of stenosis after corrective surgery on the heart valve; narrowing of a structure (usually a coronary artery) following the removal or reduction of a previous ...
restiform
Ropelike; rope-shaped; referring to the r. body, the larger (lateral) part of the inferior cerebellar peduncle; contains fibers from the spinal cord (spinocerebellar) and medulla ...
Resting phase
More appropriately called interphase. The interval in the cell cycle between two cell divisions when the individual chromosomes cannot be distinguished, interphase was once ...
restitope
The part of the T cell receptor that associates with the class II major histocompatibility molecule. [restriction + -tope]
Restitution
In cytogenetics, the spontaneous rejoining of broken chromosomes to reconstitute the original chromosome configuration. * * * In obstetrics, the return of the rotated head of ...
Restless leg syndrome
An uncomfortable creeping, crawling, tingling, pulling, twitching, tearing, aching, throbbing, prickling or grabbing sensation in the calves that occurs while sitting or while ...
restoration
In dentistry : 1. A prosthetic r. or appliance; a broad term applied to any inlay, crown, bridge, partial denture, or complete denture that restores or replaces lost tooth ...
restorative
1. Renewing health and strength. 2. An agent that promotes a renewal of health or strength. [L. restauro, to restore]
restraint
In hospital psychiatry, intervention to prevent an excited or violent patient from doing harm to self or others; may involve the use of a camisole (straightjacket). [O. Fr. ...
restriction
1. The process with which foreign DNA that has been introduced into a prokaryotic cell becomes ineffective. 2. A limitation. - asymmetric fetal growth r. normal fetal head size ...
Restriction endonuclease
An enzyme from bacteria that can recognize specific base sequences in DNA and cut (restrict) the DNA at that site (the restriction site). Also called a restriction enzyme.
Restriction enzyme
An enzyme from bacteria that can recognize specific base sequences in DNA and cut the DNA at that site (the restriction site). A restriction enzyme acts as a biochemical ...
Restriction fragment length polymorphism (RFLP)
A difference in DNA between people that can be recognized by the use of a restriction enzyme.
Restriction map
An array of sites in DNA susceptible to cleavage by diverse restriction enzymes.
Restriction site
A sequence in DNA that can be recognized and cut by a specific restriction enzyme.
resuscitate
To perform resuscitation. [L. resuscito, to raise up again, revive]
resuscitation
Revival from potential or apparent death. [L. resuscitatio] - cardiopulmonary r. (CPR) restoration of cardiac output and pulmonary ventilation following cardiac arrest and ...
retainer
Any type of clasp, attachment, or device used for the fixation or stabilization of a prosthesis; an appliance used to prevent the shifting of teeth following orthodontic ...
retardate
A mildly pejorative term, which is decreasing in usage, for a person who has mental retardation. [L. retardo, to delay, hinder]
retardation
Slowness or limitation of development. - intrauterine growth r. SYN: fetal growth restriction. - mental r. subaverage general intellectual functioning that originates during the ...
Retardation, reading
Reading retardation means impaired ability to read. Reading retardation is an impairment that may, for example, reflect mental retardation or cultural deprivation. Reading ...
retarder
An agent used to slow the chemical hardening of gypsum, resins, or impression materials used in dentistry.
retch
To make an involuntary effort to vomit. [A.S. hraecan, to hawk]
retching
Gastric and esophageal movements of vomiting without expulsion of vomitus. SYN: dry vomiting, vomiturition.
rete
1. SYN: network (1). 2. A structure composed of a fibrous network or mesh. [L. a net] - r. acromiale arteriae thoracoacromialis [TA] SYN: acromial anastomosis of the ...
retention
1. The keeping in the body of what normally belongs there, especially the retaining of food and drink in the stomach. 2. The keeping in the body of what normally should be ...
retia
Plural of rete. [L.]
retial
Relating to a rete.
reticul-
See reticulo-.
reticula
Plural of reticulum. [L.]
reticular, reticulated
Relating to a reticulum.
reticulation
The presence or formation of a reticulum or network, such as that observed in the red blood cells during active regeneration of blood. Also used to describe a chest ...
reticulin
Name given to the chemical substance of reticular fibers, which once were thought to be distinct from collagen by reason of their distinctive structure and staining properties but ...
reticulo-, reticul-
Reticulum; reticular. [L. reticulum, a small net, dim. of rete, a net]
reticulocyte
A young red blood cell containing a basophilic cytoplasmic network precipitated by brilliant cresyl blue representing residual polyribosomes; such cells become more numerous ...
reticulocytopenia
Paucity of reticulocytes in the blood. SYN: reticulopenia. [ reticulocyte + G. penia, poverty]
reticulocytosis
An increase in the number of circulating reticulocytes above the normal, which is less than 1% of the total number of red blood cells; it occurs during active blood regeneration ...
reticuloendothelial
Denoting or referring to reticuloendothelium. See r. system.
reticuloendothelioma
Obsolete term for a localized reticulosis, or neoplasm derived from reticuloendothelial tissue. [ reticuloendothelium + G. -oma, tumor]
reticuloendothelium
The cells making up the reticuloendothelial system. [reticulo- + endothelium]
reticulohistiocytoma
A solitary skin nodule composed of glycolipid-containing multinucleated large histiocytes; multiple lesions sometimes occur in association with arthritis. [reticulo- + ...
reticulohistiocytosis
See reticulosis. - multicentric r. a rare disease in which cutaneous papules composed of histiocytes containing glycolipids are associated with polyarthritis, often leading to ...
reticuloid
1. Resembling a reticulosis. 2. A condition resembling reticulosis. - actinic r. chronic pruritic erythema beginning on sun-exposed areas in elderly males, with marked ...
reticulopenia
SYN: reticulocytopenia.
reticulosis
An increase in histiocytes, monocytes, or other reticuloendothelial elements. [reticulo- + G. -osis, condition] - benign inoculation r. SYN: catscratch disease. - leukemic r. ...
reticulospinal
Pertaining to the r. tract.
reticulotomy
Production of lesions in the reticular formation. [reticulo- + G. tome, incision]
reticulum
1. A fine network formed by cells, or formed of certain structures within cells or of connective tissue fibers between cells. 2. SYN: neuroglia. 3. The second compartment of ...
retiform
Resembling a net or network. [L. rete, network]
retin-
See retino-.
Retina
The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain. There is a small area, called ...
Retina, detached
: A retina that separates from its connection at the back of the eye. The process of retinal detachment is usually due to a tear (a rip) in the retina, often when the vitreous ...
retinaculum
A frenum, or a retaining band or ligament. [L. a band, a halter, fr. retineo, to hold back] - antebrachial flexor r. thickening of distal antebrachial fascia just proximal to ...
retinal
1. Relating to the retina. 2. Retinaldehyde; most commonly referring to the all-trans form. - r. dehydrogenase an oxidoreductase catalyzing the interconversion of ...
Retinal artery, central
The blood vessel that carries blood into the eye and supplies nutrition to the retina. The counterpart to the central retinal artery is the central retinal vein, the vessel that ...
Retinal detachment
A separation of the retina from its connection at the back of the eye. The separation usually results from a tear (that is, a rent or rip, not a tear drop) in the retina. The tear ...
Retinal fundus
The interior lining of the eyeball, including the retina (the light-sensitive screen), optic disc (the head of the nerve to the eye), and the macula (the small spot in the retina ...
Retinal pigment epithelium
The pigment cell layer that nourishes the retinal cells. The retinal pigment epithelium is located just outside the retina and is attached to what is called the choroid, a layer ...
Retinal vasculitis
The retina is the portion of the eye that contains the nerves of sensation that perceive light. It is also filled with tiny blood vessels. Vasculitis of the eye is typically the ...
Retinal vein, central
The blood vessel that carries blood away from the retina of the eye. The counterpart to the central retinal vein is the central retinal artery, the blood vessel that carries ...
retinaldehyde
Retinol oxidized to a terminal aldehyde; retinal; a carotene released (as all-trans-retinal) in the bleaching of rhodopsin by light and the dissociation of opsin in the ...
retinectomy
A surgical excision of a piece of the retina.
retinene
SYN: retinaldehyde.
retinene-1
SYN: retinaldehyde.
retinene-2
SYN: dehydroretinaldehyde.
retinitis
Inflammation of the retina. [retina + G. -itis, inflammation] - albuminuric r. hypertensive retinopathy. - circinate r. circinate retinopathy. - diabetic r. diabetic ...
Retinitis pigmentosa and congenital deafness
(Also called Usher syndrome.) A genetic disorder characterized by hearing impairment and an eye disorder called retinitis pigmentosa in which vision worsens over time. Some ...
retino-, retin-
The retina. [Med. L. retina]
Retinoblastoma
A malignant eye tumor caused by the loss of a pair of tumor-suppressor genes. An inherited form of retinoblastoma (it typically appears at birth, leads to multiple tumors and ...
retinochoroid
SYN: chorioretinal.
retinochoroiditis
Inflammation of the retina extending to the choroid. SYN: chorioretinitis. [ retinochoroid + G. -itis, inflammation] - bird shot r. bilateral diffuse retinal vasculitis with ...
retinodialysis
SYN: dialysis retinae. [retino- + G. dialysis, separation]
retinoic acid
Vitamin A1 acid; retinal in which the terminal –CHO has been oxidized to a –COOH; used topically in the treatment of acne; plays an important role in growth and ...
retinoid
1. Resembling a resin; resinous. [G. retine, resin, + eidos, resemblance] 2. Resembling the retina. [Mediev. L. retina] 3. In plural form, term used to describe the natural ...
retinoids
A class of keratolytic drugs derived from retinoic acid and used for treatment of severe acne and psoriasis.
Retinol
Retinol is vitamin A. Carotene compounds (found, for example, in egg yolk, butter and cream) are gradually converted by the body to vitamin A (retinol). A form of vitamin A ...
retinopapillitis
Inflammation of the retina extending to the optic disk. - r. of premature infants SYN: retinopathy of prematurity.
retinopathy
Noninflammatory degenerative disease of the retina. [retino- + G. pathos, suffering] - arteriosclerotic r. r. distinguished by attenuated retinal arterioles with increased ...
retinopexy
A procedure to repair a detached retina by holding it in place; e.g., by producing chorioretinal adhesions by freezing (“retinal cryopexy”). [retino- + G. pexis, ...
retinopiesis
Repositioning a detached retina by pressing it into position by gas or fluid. See retinopexy. [retino- + G. piesis, pressure]
retinoschisis
Degenerative splitting of the retina, with cyst formation between the two layers. [retino- + G. schisis, division] - juvenile r. [MIM*268100] r. occurring before 10 years of age ...
retinoscope
An optical device used to illuminate a subject's retina during retinoscopy. [retino- + G. skopeo, to view] - luminous r. a portable optical device providing either a circular or ...
retinoscopy
A method of determining errors of refraction by illuminating the retina and observing the rays of light emerging from the eye. SYN: scotoscopy, shadow test, skiascopy. ...
retinotomy
A surgical incision through the retina.
retinyl phosphate
The phosphoester of all-trans-retinol; essential for the biosynthesis of certain glycoproteins needed for growth regulation and for mucous secretion.
retoperithelium
The reticular cells related to the reticular fiber network, as in the stroma of lymphatic tissue. [L. rete, net, + G. peri, around, + Mod. L. thelium, fr. G. thele, nipple]
retort
1. A flasklike vessel with a long neck passing outward, once used in distilling. 2. A small furnace. [Mediev. L. retorta, fem. pp. of retorqueo, pp. -tortus, to twist or bend ...
Retortamonas
A genus of protozoan flagellates, one species of which, R. intestinalis, is found occasionally in the human intestine, although it is nonpathogenic and infrequently reported. [L. ...
retract
To shrink, draw back, or pull apart. [L. re-traho, pp. -tractus, a drawing back]
retractile
Retractable; capable of being drawn back.
retraction
1. A shrinking, drawing back, or pulling apart. 2. Posterior movement of teeth, usually with the aid of an orthodontic appliance. [L. retractio, a drawing back] - gingival r. ...
retractor
1. An instrument for drawing aside the edges of a wound or for holding back structures adjacent to the operative field. 2. A muscle that draws a part backward, e.g., the middle ...
retrad
Backward; toward the back part; directed posteriorly. [L. retro, backward, + ad, to]
retrahens aurem, retrahens auriculam
See auricularis posterior (muscle). [L. drawing back the ear, or auricle]
retreat from reality
Substitution of imaginary satisfactions or fantasy for relations with the real world.
retrenchment
The cutting away of superfluous tissue. [F. re-, back, + trancher, to cut]
retrieval
The third stage in the memory process, after encoding and storage, involving mental processes associated with bringing stored information back into consciousness. SEE ALSO: ...
retro-
Backward or behind. [L. back, backward]
retro-ocular
SYN: retrobulbar.
retroauricular
Behind the auricle.
retrobuccal
Relating to the back part of, or behind, the cheek.
retrobulbar
Behind the eyeball. SYN: retro- ocular.
retrocalcaneobursitis
SYN: achillobursitis. [ retro- + L. calcaneum heel, + bursitis]
retrocecal
Posterior to the cecum.
retrocervical
Posterior to the cervix uteri.
retrocession
1. A going back; a relapse. 2. Cessation of the external symptoms of a disease followed by signs of involvement of some internal organ or part. 3. Denoting a position of the ...
retroclusion
A form of acupressure for the arrest of bleeding; the needle is passed through the tissues above the cut end of the artery, is turned around, and then is passed backward beneath ...
retrocolic
Posterior to the colon. [ retro- + G. kolon, colon]
retrocollic
Relating to the back of the neck; drawing back the head. [ retro- + L. collum, neck]
retroconduction
SYN: retrograde VA conduction.
retrocursive
Running backward. [ retro- + L. cursus, a running]
retrodeviation
A backward bending or inclining.
retrodisplacement
Any backward displacement, such as retroversion or retroflexion of the uterus.
retroesophageal
Posterior to the esophagus.
retrofilling
Placement of a sealing material into the apical foramen of a dental root from the apical end.
retroflected
SYN: retroflexed.
retroflection
SYN: retroflexion.
retroflexed
Bent backward or posteriorly. SYN: retroflected. [ retro- + L. flecto, pp. flexus, to bend]
retroflexion
Backward bending, as of the uterus when the corpus is bent back, forming an angle with the cervix. SYN: retroflection. - r. of iris abnormal position of the iris on the ciliary ...
retrognathic
Denoting a state in which the mandible is located posterior to its normal position in relation to the maxillae.
retrognathism
A condition of facial disharmony in which one or both jaws are posterior to normal in their craniofacial relationships; usually used in reference to the mandible. [ retro- + G. ...
retrograde
1. Moving backward. 2. Degenerating; reversing the normal order of growth and development. [L. retrogradus, fr. retro- + gradior, to go]
Retrograde amnesia
Amnesia in which the lack of memory relates to events occurring before a traumatic occurrence.
Retrograde intrarenal surgery (RIRS)
Retrograde intrarenal surgery (RIRS) is a procedure for doing surgery within the kidney using a viewing tube called a fiberoptic endoscope. In RIRS the scope is placed through ...
retrography
SYN: mirror-writing. [ retro- + G. grapho, to write]
retrogression
SYN: cataplasia. [L. retrogressus fr. retrogradior, to go backwards]
retroinhibition
SYN: feedback inhibition.
retroiridian
Posterior to the iris.
retrojection
The washing out of a cavity by the backward flow of an injected fluid. [L. retro, backward, + jacio, to throw]

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