| ADA | adenosine deaminase; American Dental Association; American Dermatological Association; American Diab... |
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| AGA | accelerated growth area; allergic granulomatosis and angiitis; American Gastroenterological Associat... |
| AOA | American Osteopathic Association; Administration on Aging; Alpha Omega Alpha Honor Society; American... |
| AAMA | American Academy of Medical Administrators; American Association of Medical Assistants |
| AAMC | American Association of Medical Clinics; Association of American Medical Colleges |
| double first | <engineering> A degree of the first class both in classics and mathematics. One who gains at examinations the highest honor both in the classics and the mathematics. Source: Websters Dictionary (01 Mar 1998) |
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| error of the first kind | See: Error, alpha. (12 Dec 1998) |
| tuberosity of first metatarsal | A tubercle at the base of the bone to which is attached the tendon of the peroneus longus muscle. Synonym: tuberositas ossis metatarsalis primi. (05 Mar 2000) |
| first | 1. Preceding all others of a series or kind; the ordinal of one; earliest; as, the first day of a month; the first year of a reign. 2. Foremost; in front of, or in advance of, all others. 3. most eminent or exalted; most excellent; chief; highest; as, Demosthenes was the first orator of Greece. at first blush. See Blush. At first hand, from the first or original source; without the intervention of any agent. "It is the intention of the person to reveal it at first hand, by way of mouth, to yourself." (Dickens) First coat The first year's whole profits of a benefice or spiritual living. The earliest effects or results. "See, Father, what first fruits on earth are sprung From thy implanted grace in man!" (Milton) First mate, an officer in a merchant vessel next in rank to the captain. First name, same as Christian name. See Name, First officer, the watch from eight to twelve at midnight; also, the men on duty during that time. First water, the highest quality or purest luster; said of gems, especially of diamond and pearls. Synonym: Primary, primordial, primitive, primeval, pristine, highest, chief, principal, foremost. Origin: OE. First, furst, AS. Fyrst; akin to Icel. Fyrstr, Sw. & Dan. Forste, OHG. Furist, G. Furst prince; a superlatiye form of E. For, fore. See For, Fore, and cf. Formeer, Foremost. Source: Websters Dictionary (01 Mar 1998) |
| first aid | Treatment that is rendered initially for the care of an emergent condition. (27 Sep 1997) |
| first arch syndrome | <syndrome> Generic term including syndrome's of malformations involving derivatives of the first branchial arch, with or without associated malformations; includes mandibulofacial dysostosis, micrognathia with peromelia, otomandibular dystosis, acrofacial dysostosis, and others. (05 Mar 2000) |
| first-class | Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope. First-class car or First-class railway carriage, any passenger car of the highest regular class, and intended for passengers who pay the highest regular rate; distinguished from a second-class car. Source: Websters Dictionary (01 Mar 1998) |
| first cranial nerve | Collective term denoting the numerous olfactory filaments: slender fascicles each composed of the thin, unmyelinated axons of 8 to 12 of the bipolar olfactory receptor cells in the olfactory portion of the nasal mucosa; the olfactory filaments pass through the cribriform plate of the ethmoid bone and enter the olfactory bulb, where they terminate in synaptic contact with mitral cells, tufted cells, and granule cells. See: olfactory tract. Synonym: nervi olfactorii, fila olfactoria, first cranial nerve, nerve of smell, olfactory fila. (05 Mar 2000) |
| first cuneiform bone | The largest of the three cuneiform bones, the medial bone of the distal row of the tarsus, articulating with the intermediate cuneiform, navicular, and first and second metatarsal bones. Synonym: os cuneiforme mediale, first cuneiform bone, wedge bone. (05 Mar 2000) |
| first degree A-V block | See: atrioventricular block. (05 Mar 2000) |
| first degree burn | A burn involving only the epidermis and causing erythema and oedema without vesiculation. Synonym: superficial burn. (05 Mar 2000) |
| first dentition | A tooth of the first set of teeth, comprising 20 in all, that erupts between the mean ages of 6 and 28 months of life. Synonym: dens deciduus, baby tooth, deciduous dentition, dens lacteus, first dentition, milk tooth, primary dentition, primary tooth, temporary tooth. (05 Mar 2000) |
| first duodenal sphincter | The sphincter supposedly located at the level of the aboral extremity of the duodenal bulb. (05 Mar 2000) |
| first finger | The first digit on the radial side of the hand. Synonym: digitus primus, pollex, first finger. Origin: A.S. Thuma (05 Mar 2000) |
| first heart sound | Occurs with ventricular systole and is mainly produced by closure of the atrioventricular valves. (05 Mar 2000) |