| acroparesthesia syndrome | <syndrome> Abnormal sensation such as numbness and tingling in the hands, usually in middle-aged women; classic symptom of carpal tunnel syndrome. (05 Mar 2000) |
|---|---|
| acropathy | Synonym: hereditary clubbing. Origin: acro-+ G. Pathos, disease (05 Mar 2000) |
| acropetal | <botany> Describes a plant part which is arising or developing in a longitudinal sequence beginning at the base and proceeding towards the apex. (13 Nov 1997) |
| acrophobia | Morbid fear of heights. Origin: acro-+ G. Phobos, fear (05 Mar 2000) |
| acropigmentation | Hyperpigmentation of the dorsal surfaces of the fingers and toes beginning in early childhood and usually increasing with age; more common in persons of dark complexion. (05 Mar 2000) |
| acropleurogenous | Denoting spores developing at the tip and along the sides of fungal hyphae. (05 Mar 2000) |
| acropodium | <zoology> The entire upper surface of the foot. Origin: Gr. Topmost +, foot. Source: Websters Dictionary (01 Mar 1998) |
| acropustulosis | Pustular eruptions of the hands and feet, often a form of psoriasis. Origin: acro-+ pustulosis Infantile acropustulosis, a cyclically recurrent papulopustular and crusting pruritic eruption, usually in black children, appearing soon after birth to 10 months; remission occurs at about 2 years of age. (05 Mar 2000) |
| acroscleroderma | Synonym: acrosclerosis. Origin: acro-+ G. Skleros, hard, + derma, skin (05 Mar 2000) |
| acrosclerosis | Stiffness and tightness of the skin of the fingers, with atrophy of the soft tissue and osteoporosis of the distal phalanges of the hands and feet; a limited form of progressive systemic sclerosis occurring with Raynaud's phenomenon. See: CREST syndrome. Synonym: acroscleroderma, sclerodactyly, sclerodactylia. (05 Mar 2000) |
| acrosin | <enzyme> An enzyme found in sperm cells which is thought to help the sperm penetrate the tough outer surface of the ovum. (13 Nov 1997) |
| acrosomal cap | A collapsed membranous vesicle that covers the anterior part of the nucleus of the spermatozoon, derived from the acrosomal granule; the carbohydrate-rich substance of the cap is associated with hydrolytic enzymes that aid in sperm penetration of the zona pellucida of the ovum. Synonym: head cap. (05 Mar 2000) |
| acrosomal granule | The single glycoprotein rich granule within an acrosomal vesicle, which results from the coalescence of proacrosomal granule's. (05 Mar 2000) |
| acrosomal vesicle | A vesicle derived from the Golgi apparatus during spermiogenesis whose limiting membrane adheres to the nuclear envelope; together with the acrosomal granule within, it spreads in a thin layer over the pole of the nucleus to form the acrosomal cap. (05 Mar 2000) |
| acrosome | <cell biology> A membrane-bound compatment at the tip of the head of a sperm which contains lytic enzymes (hyaluronidase in mammalian sperm) which digest the outer surface of the egg and allow the sperm to inject its haploid DNA. The compartment is secreted by the Golgi apparatus of the spermatid. Origin: Gr. Soma = body (12 Mar 1998) |