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opposure
Bringing together of tissue during suturing.
opsin
The protein portion of the rhodopsin molecule; at least three separate opsins are located in cone cells.
opsinogen
A substance that stimulates the formation of opsonin, such as the antigen contained in a suspension of bacteria used for immunization. SYN: opsogen. [ opsonin + -gen]
opsiuria
A more rapid excretion of urine during fasting than after a full meal. [G. opsi, late, + ouron, urine]
opsoclonus
Rapid, irregular, nonrhythmic movements of the eye in horizontal and vertical directions. [G. ops, opos, eye, + klonos, confused motion]
opsogen
SYN: opsinogen.
opsomania
A rarely used term for a longing for a particular article of diet, or for highly seasoned food. [G. opson, seasoning, + mania, frenzy]
opsonic
Relating to opsonins or to their utilization.
opsonin
Any blood serum protein that binds to antigens, enhancing phagocytosis ( e.g., C3b of the complement system, specific antibodies). [G. opson, boiled meat, provisions, fr. hepso, ...
opsonization
The process by which bacteria and other cells are altered in such a manner that they are more readily and more efficiently engulfed by phagocytes.
opsonocytophagic
Pertaining to the increased efficiency of phagocytic activity of the leukocytes in blood that contains specific opsonin. [ opsonin + G. kytos, a hollow (cell), + phago, to eat] ...
opsonometry
Determination of the opsonic index or the opsonocytophagic activity.
opsonophilia
The condition in which bacteria readily unite with opsonins, thereby sensitizing them for more effective phagocytosis. [ opsonin + G. phileo, to love]
opsonophilic
Pertaining to, characterized by, or resulting in opsonophilia.
Optic cup
The white, cup-like area in the center of the optic disc. The optic disk is the circular area at the back of the inside of the eye where the optic nerve connects to the retina.
Optic disc
The circular area in the back of the inside of the eye where the optic nerve connects to the retina. Also called the optic nerve head.
Optic nerve
The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and ...
Optic nerve head
The circular area in the back of the inside of the eye where the optic nerve connects to the retina.
Optic nerve pathways
The left and right branches of the optic nerves join behind the eyes, just in front of the pituitary gland, to form a cross-shaped structure called the optic chiasma. Within the ...
optic, optical
Relating to the eye, vision, or optics. [G. optikos]
Optician
A specialist in fitting eyeglasses and making lenses to correct vision problems. An optometrist performs eye examinations and writes prescriptions for corrective lenses; an ...
opticianry
The professional practice of filling prescriptions for ophthalmic lenses, dispensing spectacles, and making and fitting contact lenses.
optico-
See opto-.
opticociliary
Relating to the optic and ciliary nerves.
opticopupillary
Relating to the optic nerve and the pupil.
optics
The science concerned with the properties of light, its refraction and absorption, and the refracting media of the eye in that relation. [G. optikos, fr. ops, eye] - Nomarski o. ...
optimism
The tendency to look on the bright side of everything, to believe that there is good in everything. [L. optimus, best] - therapeutic o. a belief in the efficacy of drugs and ...
optimum
The best or most suitable; e.g., denoting the dose of a remedy likely to give most benefit with fewest side effect s, the temperature or pH at which an enzyme has maximal ...
opto-, optico-
Optical; optic; ocular. [G. optikos, optical, from ops, eye]
optokinetic
See o. nystagmus. [opto- + G. kinesis, movement]
optomeninx
SYN: retina. [opto- + G. meninx, membrane]
optometer
An instrument for determining the refraction of the eye. [opto- + G. metron, measure] - objective o. SYN: refractometer.
Optometrist
A health care professional who is licensed to provide primary eye care services: {{}}to examine and diagnose eye diseases such as glaucoma, cataracts, and retinal diseases and, in ...
optometry
1. The profession concerned with the examination of the eyes and related structures to determine the presence of vision problems and eye disorders and with the prescription and ...
optomyometer
An instrument for determining the relative power of the extrinsic muscles of the eye. [opto- + G. mys, muscle, + metron, measure]
optotypes
Test letters. See test types. [opto- + G. typos, type]
OPV
Abbreviation for oral poliovirus vaccine. See poliovirus vaccines, under vaccine.
OR (abbreviation)
Stands for " operating room". A facility equipped for performing surgery. OR is sometimes written O.R.
ora
An edge or a margin. [L.] - o. serrata retinae the serrated extremity of the optic part of the retina, located a little behind the ciliary body and marking the limits of the ...
ora1
Plural of L. os, the mouth. [L.]
orad
1. In a direction toward the mouth. 2. Situated nearer the mouth in relation to a specific reference point; opposite of aborad. [L. os, mouth, + ad, to]
Oral
Having to do with the mouth; given by mouth, as in an oral solution. * * * Relating to the mouth. [L. os (or-), mouth]
Oral candidiasis
Yeast infection of the mouth and throat caused by the fungus Candida albicans; also known as thrush. Yeast organisms are part of the germs normally found in various parts of the ...
Oral contraceptive
A birth control pill taken by mouth. Most oral contraceptives include both estrogen and progesterone. When given in certain amounts and at certain times in the menstrual cycle, ...
Oral contraceptive, combined
Commonly called "the pill," combined oral contraceptives are the most commonly used form of reversible birth control in the United States. This form of birth control suppresses ...
Oral Hygiene Index
An index used in epidemiologic studies of dental disease to evaluate dental plaque and dental calculus separately.
Oral moniliasis
Yeast infection of the mouth and throat caused by a fungus formerly called Monilia, now known as Candida albicans. This infection is also known as thrush. Yeast organisms are ...
Oral rehydration therapy
The administration of special fluids by mouth. ORT is used to treat dehydration. See also oral rehydration solution.
Oral surgeon
: A dentist with special training in surgery of the mouth and jaw.
Oral-motor
Relating to the muscles of the mouth and/or mouth movements.
orale
A point at the lingual side of the alveolar termination of the premaxillary suture. [Mod. L. punctum o., oral point, fr. L. os (or-), mouth]
orality
In freudian psychology, a term used to denote the psychic organization derived from, and characteristic of, the oral period of psychosexual development.
Oram
Samuel, 20th century English cardiologist. See Holt-O. syndrome.
orange
1. The fruit of the o. tree, Citrus aurantium (family Rutaceae). 2. A color between yellow and red in the spectrum. For individual o. dyes, see specific name. [O.F. orenge, fr. ...
orange G
An azo dye, used as a cytoplasmic stain in histologic techniques.
orange wood
A soft wood used in dentistry for placement of bridges, crowns, etc. by biting pressure, also used as a burnishing point in the polishing of root surfaces.
Orbeli
Leon A., Russian physiologist, 1882–1958. See O. effect.
orbicular
Similar in form to an orb; circular in form. [L. orbiculus, a small disk, dim. of orbis, circle]
orbiculare
SYN: lenticular process of incus. [L., fr. orbiculus, a small disk]
orbicularis
1. Circular; denoting a circular or disk-shaped structure. 2. SYN: orbicular muscle. [L. fr. orbiculus, a small disk]
orbiculus ciliaris
The darkly pigmented posterior zone of the ciliary body continuous with the retina at the ora serrata. SYN: ciliary disk, ciliary ring, pars plana. [Mod. L.]
Orbit
In medicine, the orbit is the bony cavity in which the eyeball sits. * * * The bony cavity containing the eyeball and its adnexa; it is formed of parts of seven bones: the ...
orbita
SYN: orbit. [L. a wheel-track, fr. orbis, circle]
Orbital
Relating to the orbit, in anatomy the bony cavity that contains the eyeball. * * * Relating to the orbits.
Orbital fracture
A break in one of the bones that make up the orbit. Since the orbit is the seat of the globe (the eye), an orbital fracture can be a serious, sight-threatening break. (Goggles ...
orbitale
In cephalometrics, the lowermost point in the lower margin of the bony orbit that may be felt under the skin. [L. of an orbit]
orbitography
Radiographic evaluation of the orbit. [L. orbita, orbit, + G. grapho, to write] - positive contrast o. o. with injection of a water soluble iodinated compound into the muscle ...
orbitonasal
Relating to the orbit and the nose or nasal cavity.
orbitonometer
An instrument that measures the resistance offered to pressing the eyeball backwards into its socket. [L. orbita, orbit, + G. metron, measure]
orbitonometry
Measurement by means of the orbitonometer.
orbitopagus
Unequal conjoined twins in which the parasite, usually very imperfectly developed, is attached at an orbit of the autosite. See conjoined twins, under twin. SYN: teratoma ...
orbitopathy
Disease of the orbit and its contents. - dysthyroid o. inflammation of the orbit in Graves disease. - Graves o. SYN: Graves ophthalmopathy.
orbitosphenoid
Relating to the orbit and the sphenoid bone.
orbitotomy
Surgical incision into the orbit. [L. orbita, orbit, + tome, a cutting]
Orbivirus
A genus of viruses of vertebrates (family Reoviridae) that multiply in arthropods, including certain viruses formerly included with the arboviruses. They are antigenically ...
orcein
A natural dye derived from orcinol by treatment with air and ammonia, which as a purple dye complex is used in various histologic staining methods.
orchalgia
SYN: orchialgia.
orchectomy
SYN: orchiectomy.
orchella
SYN: archil.
orcheo-
See orchio-.
orchi-, orchido-, orchio-
The testes. [G. orchis, testis]
orchialgia
Pain in the testis. SYN: orchalgia, orchiodynia, orchioneuralgia, testalgia. [orchi- + G. algos, pain]
orchichorea
Involuntary rising and falling movements of the testis. [orchi- + G. choreia, a dance]
orchidectomy
SYN: orchiectomy.
orchidic
Relating to the testis.
orchiditis
SYN: orchitis.
orchido-
See orchi-.
orchidometer
1. A caliper device used to measure the size of testes. 2. A set of sized models of testes for comparison of testicular development. [ orchido- + G. metron, measure]
orchidopexy
SYN: orchiopexy.
orchidoptosis
Ptosis of the male gonads. [ orchido- + G. ptosis, a falling]
orchidorraphy
SYN: orchiopexy.
orchiectomy
Removal of one or both testes. SYN: orchectomy, orchidectomy, testectomy. [orchi- + G. ektome, excision]
orchiepididymitis
Inflammation of the testis and epididymis. [orchi- + epididymis, + G. -itis, inflammation]
orchil
SYN: archil.
orchio-
See orchi-.
orchiocele
A testis retained in the inguinal canal. [ orchio- + G. kele, hernia, tumor]
orchiodynia
SYN: orchialgia. [orchi- + G. odyne, pain]
orchioncus
A neoplasm of the testis. [ orchio- + G. onkos, bulk, mass]
orchioneuralgia
SYN: orchialgia. [ orchio- + G. neuron, nerve, + algos, pain]
orchiopathy
Disease of a testis. [ orchio- + G. pathos, suffering]
Orchiopexy
Surgery to bring down an undescended testicle. * * * 1. Surgical treatment of an undescended testicle by freeing it and implanting it into the scrotum. 2. Anchoring a testis ...
orchioplasty
Surgical reconstruction of the testis. [ orchio- + G. plastos, formed]
orchiorrhaphy
SYN: orchiopexy. [ orchio- + G. rhaphe, a suture]
orchiotherapy
Treatment with testicular extracts.
orchiotomy
Incision into a testis. SYN: orchotomy. [ orchio- + G. tome, incision]
orchis
SYN: testis. [G. testis, an orchid]
orchitic
Denoting orchitis.
Orchitis
Inflammation of the testis (male sex organ). There are many causes of inflammation of the testis including infections (such as mumps), diseases (such as polyarteritis nodosa), or ...
orchotomy
SYN: orchiotomy.
orcin
SYN: orcinol.
orcinol
3,5-Dihydroxytoluene; the parent substance of the natural dye orcein, obtained from certain colorless lichens (Lecanora tinctoria, Rocella tinctoria) by treatment with boiling ...
orciprenaline sulfate
SYN: metaproterenol sulfate.
ORD
Abbreviation for optic rotatory dispersion.
Ord
Symbol for orotidine.
ordeal bean
SYN: physostigma.
order
1. In biologic classification, the division just below the class (or subclass) and above the family. 2. In a reaction, o. is the sum of the exponents of all the concentration ...
ordered
SYN: o. mechanism.
orderly
An attendant in a hospital unit who assists in the care of patients.
ordinate
In a plane cartesian coordinate system, the vertical axis (y). Cf.:abscissa.
orectic
Pertaining to or characterized by orexia.
orexia
1. The affective and conative aspects of an act, in contrast to the cognitive aspect. 2. SYN: appetite. [G. orexis, appetite]
orexigenic
Appetite stimulating.
orf
A specific disease of sheep and goats, caused by the o. virus, family Poxviridae. This virus is transmissible to humans and characterized by vesiculation and ulceration of the ...
organ
Any part of the body exercising a specific function, as of respiration, secretion, or digestion. SYN: organum [TA], organon. [L. organum, fr. G. organon, a tool, instrument] - ...
organ-specific
1. Denoting or pertaining to a serum produced by the injection of the cells of a certain organ or tissue that, when injected into another animal, destroys the cells of the ...
organa
Plural of organum.
organelle
One of the specialized parts of a protozoan or tissue cell; these subcellular units include mitochondria, the Golgi apparatus, nucleus and centrioles, granular and agranular ...
Organic
1) A chemical compound that contains carbon. 2) Related to an organ. 3) Grown or prepared without the use of chemicals or pesticides, as in organic food. * * * 1. Relating to an ...
Organic brain syndrome
Psychiatric or neurological symptoms arising from damage to or disease in the brain. Also called organic mental disorder. See also neurobiological disorder.
Organic dust toxic syndrome
A flu-like illness due to the inhalation of grain dust with symptoms including fever, chest tightness, cough and muscle aching. The inhalation of the grain dust may occur in an ...
organicism
A theory that attributes all diseases, in particular, all mental disorders, as organic in origin.
organicist
One who believes in, or subscribes to the views of, organicism.
organidin
SYN: iodinated glycerol.
Organisation Mondiale de la Sante
The French name for the World Health Organization (WHO), a specialized agency of the United Nations established in 1948 to further international cooperation for improved health ...
organism
Any living individual, whether plant or animal, considered as a whole. - calculated mean o. (CMO) a hypothetical o. whose characters are the means of both the positive and ...
organization
1. An arrangement of distinct but mutually dependent parts. 2. The conversion of coagulated blood, exudate, or dead tissue into fibrous tissue. - health maintenance o. (HMO) a ...
organize
To provide with, or to assume, a structure.
organizer
1. Originally applied to a group of cells on the dorsal lip of the blastopore, which induce differentiation of cells in the embryo and control growth and development of ...
organo-
Organ; organic. [G. organon]
organoaxial
Rotation around the long axis of the organ; a type of gastric volvulus.
organoferric
Relating to an organic compound containing iron.
organogel
A hydrogel with an organic liquid instead of water as the dispersion means.
organogenesis
Formation of organs during development. SYN: organogeny. [ organo- + G. genesis, origin]
organogenetic, organogenic
Relating to organogenesis.
organogeny
SYN: organogenesis.
organography
A treatise on, or description of, the organs of the body. [ organo- + G. graphe, a writing]
organoid
1. Resembling in superficial appearance or in structure any of the organs or glands of the body. 2. Composed of glandular or organic elements and not of a single tissue; ...
organoleptic
1. Stimulating any of the organs of sensation. 2. Susceptible to a sensory stimulus. [ organo- + G. leptikos, disposed to accept]
organology
Branch of science concerned with the anatomy, physiology, development, and functions of the various organs. SEE ALSO: splanchnology. [ organo- + G. logos, study]
organomegaly
SYN: visceromegaly.
organomercurial
Any organic mercurial compound; e.g., merbromin, thimerosal.
organometallic
Denoting an organic compound containing one or more metallic atoms in its structure.
organon
SYN: organ. [G. organ]
organonomy
The body of laws regulating the life processes of organized beings. [ organo- + G. nomos, law]
organonymy
The nomenclature of the organs of the body, as distinguished from toponymy. [ organo- + G. onyma, name]
organopathy
Any disease especially affecting one of the organs of the body. [ organo- + G. pathos, suffering]
organopexy, organopexia
Fixation by suture or otherwise of a floating or ptotic organ. [ organo- + G. pexis, fixation]
organophilic
Pertaining to organophilicity.
organophilicity
Attraction of nonpolar substances (organic molecules) to each other.
organophosphates
A series of phosphorus-containing organic compounds usually also containing a halide ion that reacts with cholinesterase. O. phosphorylate cholinesterase and thus irreversibly ...
organosol
A hydrosol with an organic liquid instead of water as the dispersion means.
organotaxis
The tendency to migrate to a certain organ selectively. [ organo- + G. taxis, orderly arrangement]
Organotherapy
The use of extracts of animal glands or organs to treat disease. * * * Treatment of disease by preparations made from animal organs; now frequently by synthetic preparations ...
organotrophic
1. Pertaining to the nourishment of an organ. 2. Pertaining to a microorganism that uses organic sources as a reducing power. [ organo- + G. trophe, nourishment]
organotropic
Pertaining to or characterized by organotropism.
organotropism
The special affinity of particular drugs, pathogens, or metastatic tumors for particular organs or their component parts. Cf.:parasitotropism. SYN: organotropy. [ organo- + G. ...
organotropy
SYN: organotropism.
Organs of reproduction, female
The internal genital structures of the female include the ovaries, the Fallopian tubes, the uterus (womb) and the vagina. The ovaries or "egg sacs" are a pair of female ...
organum
SYN: organ, organ. [L. tool, instrument] - o. auditus archaic term for vestibulocochlear organ. - organa genitalia [TA] SYN: genitalia. - organa genitalia feminina externa ...
Orgasm
A series of muscle contractions in the genital accompanied by sudden release of endorphins. Orgasm normally accompanies male ejaculation as a result of sexual stimulation, and ...
orgasmic, orgastic
Relating to, characteristic of, or tending to produce an orgasm.
orientation
1. The recognition of one's temporal, spatial, and personal relationships and environment. 2. The relative position of an atom with respect to one to which it is connected, ...
Orientation, anatomic terms of
In anatomy, certain terms are used to denote orientation. For example, a structure may be horizontal, as opposed to vertical. Some of the terms of anatomic orientation are as ...
Orientia
A member of the bacterial family Rickettsiae. - O. tsutsugamushi the only member of its genus, this species is the causative agent of scrub typhus, transmitted by mites; formerly ...
orientomycin
SYN: cycloserine.
orifice
Any aperture or opening. SEE ALSO: aperture, opening, os, ostium, meatus. SYN: orificium [TA]. [L. orificium] - anal o. SYN: anus. - aortic o. [TA] the opening from the left ...
orificial
Relating to an orifice of any kind.
orificium
SYN: orifice, orifice. [L.] - o. externum uteri SYN: external os of uterus. - o. internum uteri SYN: isthmus of uterus. - o. ureteris SYN: ureteric orifice. - o. urethrae ...
origanum oil
The volatile oil (which contains carvacrol) obtained from various species of Origanum (family Labiatae); used as a rubefacient, as a constituent in veterinary liniments, and ...
origin
1. The less movable of the two points of attachment of a muscle, that which is attached to the more fixed part of the skeleton. 2. The starting point of a cranial or spinal ...
orizaba jalap root
SYN: ipomea.
Ormond
John K., U.S. urologist, *1886. See O. disease.
Orn
Symbol for ornithine or its radical.
ornate
A term that refers to the patterning of the scutum (gray or white markings on a dark background) in ixodid ticks. [L. ornatus, decorated]
Ornish
Dean, U.S. physician, *1953. See O. reversal diet.
ornithine
2,5-Diaminovaleric acid; the l-isomer is the amino acid formed when l-arginine is hydrolyzed by arginase; not a constituent of proteins, but an important intermediate in the urea ...
Ornithine transcarbamylase (OTC) deficiency
A rare metabolic disorder, OTC is one of the urea-cycle disorders. The urea cycle is a series of five liver enzymes that help rid the body of ammonia, a toxic breakdown product ...
ornithinemia
A toxic condition occasionally producing localized cerebral swelling, caused by abnormal amounts of ornithine in the blood. [ ornithine + G. haima, blood]
ornithinuria
Excretion of excessive amounts of ornithine in the urine.
Ornithodoros
A genus of soft ticks (family Argasidae), several species of which are vectors of pathogens of various relapsing fevers. They are characterized by a capitulum hidden below the ...
Ornithonyssus
A genus of bird and rodent mites; species include O. bacoti, the tropical rat mite, a possible vector of murine typhus and a cause of human dermatitis; O. bursa, the tropical ...
Ornithophobia
An abnormal and persistent fear of birds. Sufferers from ornithophobia experience undue anxiety about encountering and even being attacked by birds although they may realize ...
ornithosis
Originally, a disease in nonpsittacine birds (domestic fowl, ducks, pigeons, turkeys, and many wild birds) caused by Chlamydia psittaci; now, generally referred to as ...
Oro
Symbol for orotic acid or orotate.
oro-
1. The mouth. [L. os, oris, mouth] 2. Obsolete alternative spelling is orrho-. See sero-. [G. orrhos, whey, serum]
orodigitofacial
Relating to the mouth, fingers, and face.
orofacial
Relating to the mouth and face.
orolingual
Relating to the mouth and tongue.
Oromandibular dystonia
Oro- refers to the mouth and mandibular refers to the lower jaw. Oromandibular dystonia affects the muscles of the jaw, lips, and tongue. The jaw may be pulled either open or ...
oronasal
Relating to the mouth and nose.
oropharyngeal
Relating to the oropharynx.
Oropharynx
: The area of the throat at the back of the mouth. * * * The portion of the pharynx that lies posterior to the mouth; it is continuous above with the nasopharynx via the ...
orosomucoid
α1-Acid glycoprotein; a subgroup of the α1-globulin fraction of blood; increased plasma levels are associated with inflammation. SYN: α1-acid glycoprotein, acid seromucoid.
orotate
A salt or ester of orotic acid. - o. phosphoribosyltransferase a phosphoribosyltransferase synthesizing orotidylate and pyrophosphate from o. and ...
orotic acid
6-Carboxyuracil; uracil-6-carboxylic acid; an important intermediate in the formation of the pyrimidine nucleotides; elevated in certain inherited defects of pyrimidine ...
orotic aciduria
A rare disorder of pyrimidine metabolism characterized by hypochromic anemia with megaloblastic changes in bone marrow, leukopenia, retarded growth, and urinary excretion of ...
orotidine
Orotic acid-3-β-d-ribonucleoside; uridine-6-carboxylic acid; elevated in cases of orotidinuria. SYN: 1-ribosylorotate. - o. 5′-monophosphate (OMP) SYN: orotidylic acid.
orotidinuria
Elevated levels of orotidine in the urine; has been observed in defects in and inhibition of orotidylic acid decarboxylase.
orotidylate
A salt or ester of orotidylic acid.
orotidylic acid
Orotidine 5′-monophosphate; an intermediate in the biosynthesis of the pyrimidine nucleosides ( cytidine and uridine) that are found in nucleic acid s. SYN: orotidine ...
orphan
See o. products, under product. [G. orphanos]
Orphan disease
A rare disease. In the United States, an orphan disease is one that affects fewer than 200,000 people. There are more than 5,000 such rare disorders. But taken together, they ...
Orphan drug
A drug that is not being produced, often a medication useful only to a small population of patients. Also, drugs available outside the US but not approved by the FDA for sale in ...
orphenadrine citrate
An antihistaminic that also has the same action and use as orphenadrine hydrochloride.
orphenadrine hydrochloride
It reduces spasm of voluntary muscles, probably by action on the cerebral motor areas; used in the symptomatic treatment of paralysis agitans and drug-induced parkinsonism.
orrho-
Serum. See sero-. [G. orrhos, oros, whey, serum]
orris
SYN: iris.
Orsi
Francesco, Italian physician, 1828–1890. See O.-Grocco method.
Orth
Johannes J., German pathologist, 1847–1923. See O. fixative, O. stain.
orth-
See ortho-.
orthesis
Rarely used term for an orthopedic brace, splint, or appliance. [ortho- + -esis, process]
orthetics
SYN: orthotics.
Ortho- (prefix)
Prefix meaning straight or erect. From the Greek "orthos" that means just that: straight or erect. Examples of terms involving ortho- include orthodontics (straightening the ...
ortho-, orth-
1. Prefix denoting straight, normal, in proper order. 2. (o-) In chemistry, italicized prefix denoting that a compound has two substitutions on adjacent carbon atoms in a ...
orthoacid
An acid in which the number of hydroxyl groups equals the valence of the acid-forming element; e.g., C(OH)4, orthocarbonic acid. When there is no such acid, the one that most ...
orthocaine
The methyl ester of 3-amino-4-hydroxybenzoic acid; a surface anesthetic agent usually used in dusting powder form.
orthocephalic
Having a head well proportioned to height; denoting a skull with a vertical index between 70 and 75. SEE ALSO: metriocephalic. SYN: orthocephalous. [ortho- + G. kephale, head]
orthocephalous
SYN: orthocephalic.
orthochromatic
Denoting any tissue or cell that stains the color of the dye used, i.e., the same color as the dye solution with which it is stained. SYN: euchromatic (1), orthochromophil, ...
orthochromophil, orthochromophile
SYN: orthochromatic. [ortho- + G. chroma, color, + philos, fond]
orthocrasia
Obsolete term for condition in which there is a normal reaction to drugs, articles of diet, etc. [ortho- + G. krasis, a mixing, temperament]
orthocytosis
A condition in which all of the cellular elements in the circulating blood are mature forms, irrespective of the proportions of various types and total numbers. [ortho- + G. ...
orthodentin
Straight tubed dentin as seen in the teeth of mammals.
orthodeoxia
Fall in arterial blood oxygen upon assuming the upright posture. Usually caused by right-to-left cardiac or vascular shunting with a posturally induced fall in left-sided ...
orthodigita
Correction of malformations of fingers or toes. [ortho- + L. digitus, finger or toe]
orthodontia
SYN: orthodontics.
Orthodontic treatment (dental braces)
The use of devices to move teeth or adjust underlying bone. The ideal age for starting orthodontic treatment is between ages 3 to 12 years. Temporomandibular joint (TMJ) ...
Orthodontics
Orthodontics is the branch of dentistry that specializes in the diagnosis, prevention and treatment of dental and facial irregularities. The technical term for these problems is " ...
orthodontist
A dental specialist who practices orthodontics.
orthodromic
Denoting the propagation of an impulse along a conduction system ( e.g., nerve fiber) in the direction it normally travels. Cf.:antidromic. [ortho- + G. dromos, course]
orthogenesis
The doctrine that evolution is governed by intrinsic factors and occurs in predictable directions. [ortho- + G. genesis, origin]
orthogenic
Relating to orthogenesis.
orthogenics
SYN: eugenics.
orthognathia
The study of the causes and treatment of conditions related to malposition of the bones of the jaws. [ortho- + G. gnathos, jaw]
orthognathic, orthognathous
1. Relating to orthognathia. 2. Having a face without projecting jaw, one with a gnathic index below 98. [ortho- + G. gnathos, jaw]
orthograde
Walking or standing erect; denoting the posture of humans; opposed to pronograde. [ortho- + L. gradior, pp. gressus, to walk]
orthokeratology
A method of molding the cornea with contact lenses to improve unaided vision. [ortho- + G. keras, horn (cornea), + logos, science]
orthokeratosis
Formation of an anuclear keratin layer, as in the normal epidermis. [ortho- + G. keras, horn, + -osis, condition]
orthokinetics
A method advocated for the treatment of hypertrophic osteoarthritis in which an attempt is made to change muscular action from one group of muscles to another set of muscles to ...
orthomechanical
Pertaining to braces, prostheses, orthotic devices, and appliances. [ortho- + mechanical]
orthomechanotherapy
Treatment with braces, prostheses, orthotic devices, or appliances. [ortho- + G. mechane, machine, + therapeia, medical treatment]
orthomelic
Correcting malformations of arms or legs. [ortho- + G. melos, limb]
orthometer
SYN: exophthalmometer. [ortho- + G. metron, measure]
orthomolecular
L.C. Pauling term denoting a therapeutic approach designed to provide an optimum molecular environment for body functions, with particular reference to the optimum ...
Orthomyxoviridae
The family of viruses that contains the 3 genera of influenza viruses, types A and B, C, and “Thogoto-like viruses.” Virions are roughly spherical or filamentous, and the ...
orthopaedic, orthopedic
Relating to orthopedics.
Orthopaedics
The branch of surgery broadly concerned with the skeletal system (bones). This particular term is commonly misspelled. Orthopedics is how this field of surgery is listed under ...
Orthopaedist
An orthopaedic surgeon, a doctor who corrects congenital or functional abnormalities of the bones with surgery, casting, and bracing. Orthopaedists also treat injuries to the ...
orthopaedist, orthopedist
One who practices orthopaedics.
Orthopedics
The branch of surgery broadly concerned with the skeletal system (bones). Orthopedics is how this field of surgery is listed under Physicians & Surgeons in the telephone Yellow ...
Orthopedist
An orthopaedic surgeon, orthopaedics being the branch of surgery broadly concerned with the skeletal system (bones). Orthopedics is how this field of surgery is listed under ...
orthopercussion
Very light percussion of the chest, made in a sagittal direction ( i.e., anteroposteriorly, and not perpendicularly to the wall of the chest); used to determine the size of the ...
orthophoria
Absence of heterophoria; the condition of binocular fixation in which the lines of sight meet at a distant or near point of reference in the absence of a fusion stimulus. [ortho- ...
orthophoric
Pertaining to orthophoria.
orthophosphate
A salt or ester of orthophosphoric acid. - inorganic o. (Pi) any ion or salt form of phosphoric acid. SYN: inorganic phosphate.

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