| ARC | A stage before AIDS, with symptoms such as swollen lymph glands, long-lasting night sweats, fevers and unusual weight loss. Also commonly called symptomatic HIV infection. This term is no longer officially recognised by the CDC. (09 Oct 1997) |
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| arc of buehler | <radiology> Persistent embryologic anastomosis between coeliac artery and superior mesenteric artery (12 Dec 1998) |
| arc of riolan | <radiology> Inconstant anastomotic artery between middle and left colic aa. (12 Dec 1998) |
| arc perimeter | A perimeter consisting of a saemicircular frame at the centre of which the patient looks while a white object is moving along the arc, the exact point where it becomes visible or invisible being noted and recorded on a chart. (05 Mar 2000) |
| arc-flash conjunctivitis | Acute keratoconjunctivitis resulting from exposure to intense ultraviolet irradiation. Synonym: actinic conjunctivitis, arc-flash conjunctivitis, flash keratoconjunctivitis, ophthalmia nivalis, snow conjunctivitis, welder's conjunctivitis. (05 Mar 2000) |
| arcade | An anatomical structure or structures (especially a blood vessel) taking the form of a series of arches. Origin: L. Arcus, arc, bow (05 Mar 2000) |
| arcadia | 1. A mountainous and picturesque district of Greece, in the heart of the Peloponnesus, whose people were distinguished for contentment and rural happiness. 2. Any region or scene of simple pleasure and untroubled quiet. "Where the cow is, there is Arcadia." (J. Burroughs) Origin: L. Arcadia, Gr. Source: Websters Dictionary (01 Mar 1998) |
| Arcanobacterium | A genus of nonmotile, facultatively anaerobic bacteria containing Gram-positive slender irregular rods, sometimes showing clubbed ends that may be in V formation with no filaments. These organisms are obligate parasites of the pharynx in farm animals and humans, occasionally causing lesions on the pharynx or skin. The type species is Arcanobacterium haemolyticum. (05 Mar 2000) |
| Arcanobacterium haemolyticum | A species that causes pharyngitis and chronic skin ulcers in humans as well as farm animals. (05 Mar 2000) |
| arcanum | Origin: L, fr. Arcanus closed, secret, fr. Arca chest, box, fr. Arcere to inclose. See Ark. 1. A secret; a mystery; generally used in the plural. "Inquiries into the arcana of the Godhead." (Warburton) 2. <medicine> A secret remedy; an elixir. Source: Websters Dictionary (01 Mar 1998) |
| arcate | Curved like a bow. (09 Oct 1997) |
| arch | <dentistry> Collectively, either the teeth or the basal bone of either jaw. (08 Jan 1998) |
| arch bar | Any one of several types of wires, bar's, or splints conforming to the arch of the teeth, extending from one side of the arch to the other and located labially, or lingually; used for the treatment of jaw fractures and/or stabilization of injured teeth. (05 Mar 2000) |
| arch length | The amount of space required for the permanent teeth as measured from the mesial aspect of the first molar on one side to the mesial aspect of the first molar on the opposite side, as measured through the contact points along an imaginary line of the dental arch. (05 Mar 2000) |
| arch length deficiency | The difference between the available circumference of the dental arch and that required to accommodate the succedaneous teeth in proper alignment. (05 Mar 2000) |
| auricular arc | A line carried over the cranium from the centre of one external auditory meatus to that of the other. Synonym: interauricular arc. (05 Mar 2000) |
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| bois d'arc | <botany> The Osage orange (Maclura aurantiaca). "The bois d'arc seems to be the characteristic growth of the black prairies." (U. S. Census (1880)) Origin: F, bow wood. So called because used for bows by the Western Indians. Source: Websters Dictionary (01 Mar 1998) |
| bregmatolambdoid arc | The line running along the sagittal suture from the bregma to the apex of the lambdoid suture. (05 Mar 2000) |
| reflex arc | The route followed by nerve impulses in the production of a reflex act, from the peripheral receptor organ through the afferent nerve to the central nervous system synapse and then through the efferent nerve to the effector organ. (05 Mar 2000) |
| mercury arc | An electric discharge through mercury vapor between electrodes, one of which is usually mercury; provides a rich source of therapeutic ultraviolet rays; the containing tube is usually quartz; may also be glass with a fluorite window. (05 Mar 2000) |
| Riolan's arc | The series of arterial arches formed in the mesentery by anastomoses between adjacent jejunal and ileal arteries and from which vasa recta arise. The arterial arcades of the ileum are shorter and more complex than those of the jejunum. See: arterial arches of ileum, arterial arches of jejunum. Synonym: intermesenteric arterial anastomosis, Riolan's arc, Riolan's arcades. (05 Mar 2000) |
| crater arc | An arc of a direct current that forms a pitlike excavation at the positive pole. (05 Mar 2000) |
| pulmonary arc | An obsolete term for pulmonary salient. (05 Mar 2000) |
| nasobregmatic arc | A line running through the midline of the forehead from the nasion to the bregma. (05 Mar 2000) |
| naso-occipital arc | The arc in the midline from the root of the nose to the inferior limit of the external occipital protuberance. (05 Mar 2000) |
| interauricular arc | A line carried over the cranium from the centre of one external auditory meatus to that of the other. Synonym: interauricular arc. (05 Mar 2000) |
| tungsten arc lamp | <apparatus> A lamp having highly compressed tungsten elements. (05 Mar 2000) |
| unipolar arc | <radiobiology> Arc between a metal surface and a plasma in contact with it. Such an arc requires only one electrode and is maintained by the thermal energy of the electrons. (09 Oct 1997) |
| flame arc | An arc between two impregnated electrodes that causes volatilization of the core with resultant flame. (05 Mar 2000) |
| longitudinal arc of skull | The line carried over the skull in the midline from the nasion to the opisthion. (05 Mar 2000) |