| xanthophane | <physiology> The yellow pigment present in the inner segments of the retina in animals. See Chromophane. Origin: Gr. Fainein = to show. Source: Websters Dictionary (01 Mar 1998) |
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| xanthophyll | <chemical> Any of several yellow accessory pigments which found in plant leaves, egg yolks and human blood plasma, these pigments are oxygenated derivatives of carotenes and are involved in photosynthesis, for example lutein, violaxanthin and neoxanthine. (11 May 1997) |
| xanthopous | <botany> Having a yellow stipe, or stem. Origin: Gr. Poys, podos = foot. Source: Websters Dictionary (01 Mar 1998) |
| xanthoproteic | <physiology> Pertaining to, or derived from, xanthoprotein; showing the characters of xanthoprotein; as, xanthoproteic acid; the xanthoproteic reaction for albumin. Source: Websters Dictionary (01 Mar 1998) |
| xanthoproteic acid | A noncrystallizable yellow substance derived from proteins upon treatment with nitric acid. (05 Mar 2000) |
| xanthoprotein | <physiology> A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange-yellow colour by the addition of ammonia. Source: Websters Dictionary (01 Mar 1998) |
| xanthoprotein reaction | A qualitative test for proteins; a yellow product is formed by reacting proteins with hot, concentrated nitric acid. (05 Mar 2000) |
| xanthopsia | <ophthalmology> A form of chromatopsia in which objects looked at appear yellow. Origin: Gr. Opsis = vision (11 May 1997) |
| xanthopsis | <oncology, pathology> Refers to yellow colouring in a cancer. Origin: Gr. Opsis = vision (09 Oct 1997) |
| xanthopsydracia | An eruption of small yellow pustules. Origin: G. Xanthos, yellow + psydrax, a blister on the tip of the tongue (05 Mar 2000) |
| xanthopterin | <chemical> 2-amino-1,5-dihydro-4,6-pteridinedione. Pigment first discovered in butterfly wings and widely distributed in plants and animals. Chemical name: 4,6-Pteridinedione, 2-amino-1,5-dihydro- (12 Dec 1998) |
| xanthopuccine | <chemistry> One of three alkaloids found in the root of the yellow puccoon (Hydrastis Canadensis). It is a yellow crystalline substance, and resembles berberine. Source: Websters Dictionary (01 Mar 1998) |
| xanthorhamnin | <chemistry> A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff. Origin: Rhamnus, the generic name of the plant bearing Persian berries. Source: Websters Dictionary (01 Mar 1998) |
| xanthorhiza | <botany> A genus of shrubby ranunculaceous plants of North America, including only the species Xanthorhiza apiifolia, which has roots of a deep yellow colour; yellowroot. The bark is intensely bitter, and is sometimes used as a tonic. Origin: Gr. Xanqos = yellow, riza = root. (09 Mar 1998) |
| xanthorhoea | <botany> A genus of endogenous plants, native to Australia, having a thick, sometimes arborescent, stem, and long grasslike leaves. See: Grass tree. Origin: Gr. Xanqos = yellow. Source: Websters Dictionary (01 Mar 1998) |