| pregneninolone | <chemical> 17 alpha-hydroxypregn-4-en-20-yn-3-one. A synthetic steroid hormone with progestational effects. Pharmacological action: progestational hormones, synthetic. Chemical name: Pregn-4-en-20-yn-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |
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| pregnenolone | <chemical> Chemical name: Pregn-5-en-20-one, 3-hydroxy-, (3beta)- (12 Dec 1998) |
| pregnenolone carbonitrile | <chemical> (3 beta,16 alpha)-3-hydroxy-20-oxopregn-5-ene-16-carbonitrile. A catatoxic steroid and microsomal enzyme inducer having significant effects on the induction of cytochrome p450. It has also demonstrated the potential for protective capability against acetaminophen-induced liver damage. Chemical name: Pregn-5-ene-16-carbonitrile, 3-hydroxy-20-oxo-, (3beta,16alpha)- (12 Dec 1998) |
| pregranulosa cells | Capsular cell's surrounding the primordial ova in the embryonic ovary; they are derived from celomic epithelium. (05 Mar 2000) |
| prehallux | <anatomy> An extra first toe, or rudiment of a toe, on the preaxial side of the hallux. Origin: NL. See Pre-, and Hallux. Source: Websters Dictionary (01 Mar 1998) |
| prehelicine | In front of the helix of the pinna. (05 Mar 2000) |
| prehemataminic acid | <chemical> Sometimes known as sialic acid, but strictly one of a family of sialic acids (which includes also N glycolyl neuraminic acid and O substituted derivatives). It is a 9 carbon sugar formed by adding to mannose three carbons from pyruvate. Occurs in the subset of glycolipids known as gangliosides and in glycoproteins. The presence of its carboxyl group on glycolipids and glycoproteins is responsible for much of the negative charge on animal cell surfaces. (04 Jul 1999) |
| prehemiplegic | Preceding the occurrence of hemiplegia. (05 Mar 2000) |
| prehensile | Adapted to seize or grasp; seizing; grasping; as, the prehensile tail of a monkey. Origin: L. Prehensus, p. P. Of prehendere to lay hold of, seize; pre- (equiv. To prae = before) + hendere (in comp), akin to E. Get: cf. F. Prehensile. See Get, and cf. Prison, Prize. Source: Websters Dictionary (01 Mar 1998) |
| prehension | The act of grasping, or taking hold of. (05 Mar 2000) |
| prehnite | <chemical> A pale green mineral occurring in crystalline aggregates having a botryoidal or mammillary structure, and rarely in distinct crystals. It is a hydrous silicate of alumina and lime. Origin: So called from the German Colonel Prehn, who first found it. Source: Websters Dictionary (01 Mar 1998) |
| prehnitic | <chemistry> Pertaining to, or designating, a tetrabasic acid of benzene obtained as a white crystalline substance; probably so called from the resemblance of the wartlike crystals to the mammillae on the surface of prehnite. Source: Websters Dictionary (01 Mar 1998) |
| prehormone | A glandular secretory product, having little or no inherent biological potency, that is converted peripherally to an active hormone. Compare: prohormone. (05 Mar 2000) |
| prehyoid | Anterior or superior to the hyoid bone; denoting certain accessory thyroid glands lying superior to the mylohyoid muscle. (05 Mar 2000) |
| prehyoid gland | An isolated mass, or one of several such masses, of thyroid tissue, sometimes present in the side of the neck, or just above the hyoid bone (suprahyoid accessory thyroid gland), or even as low as the arch of the aorta. Synonym: glandula thyroidea accessoria, accessory thyroid, prehyoid gland, suprahyoid gland, thyroidea accessoria, thyroidea ima, Wolfler's gland. (05 Mar 2000) |