| agennesis | <physiology> Impotence; sterility. Origin: Gr. Priv. + an engendering. Source: Websters Dictionary (01 Mar 1998) |
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| agenosomia | Markedly defective formation or absence of the genitalia in a foetus; usually accompanied by protrusion of the abdominal viscera through an incomplete abdominal wall. Origin: G. A-priv. + genos, sex, + soma, body (05 Mar 2000) |
| agent | <pharmacology> Any power, principle or substance capable of producing an effect, whether physical, chemical or biological. Origin: L. Agens = acting (18 Nov 1997) |
| Agent Orange | An herbicide and defoliant, consisting of (2,4,5-trichlorophenoxy)acetic acid, (2,4-dichlorophenoxy)acetic acid, and dioxin, that was widely used in the Vietnam War; it has been shown to possess residual post-exposure carcinogenic and teratogenic properties in humans. (05 Mar 2000) |
| agent, anti-infective | Something capable of acting against infection, by inhibiting the spread of an infectious agent or by killing the infectious agent outright. (12 Dec 1998) |
| agent, antihypertensive | As the name suggests, a drug aimed at reducing high blood pressure (hypertension). (12 Dec 1998) |
| agent, tocolytic | A medication that can inhibit labour, slow down or halt the contractions of the uterus. Tocolytic agents are widely used today to treat premature labour and permit pregnancy to procede and so let the foetus gain in size and maturity before being born. (12 Dec 1998) |
| agerasia | An appearance of youth in old age. Origin: G. Agerasia, eternal youth, fr. A-priv. + geras, old age (05 Mar 2000) |
| ageratum | <botany> A genus of plants, one species of which (A. Mexicanum) has lavender-blue flowers in dense clusters. Origin: NL, fr. Gr. A sort of plant; priv. + old age. Source: Websters Dictionary (01 Mar 1998) |
| ageusia | Absence of the sense of taste. (12 Dec 1998) |
| ageustia | Absence of the sense of taste. (12 Dec 1998) |
| agger | An eminence, projection, or shallow ridge. Origin: L. Mound (05 Mar 2000) |
| agger nasi | An elevation on the lateral wall of the nasal cavity lying between the atrium of the middle meatus and the olfactory sulcus; it is formed by the mucous membrane covering the base of the ethmoidal crest of the maxilla. Synonym: nasal ridge. (05 Mar 2000) |
| agger perpendicularis | <anatomy> The prominence on the cranial surface of the auricle corresponding to the triangular fossa. Synonym: eminentia fossae triangularis auricularis, agger perpendicularis, eminentia triangularis. (05 Mar 2000) |
| agger valvae venae | A slight eminence on the external wall of a vein correlating with the valvular sinus immediately proximal to the leaflets of the venous valve. Synonym: agger valvae venae. (05 Mar 2000) |