| xylindein | <chemistry> A green or blue pigment produced by Peziza in certain kinds of decayed wood, as the beech, oak, birch, etc, and extracted as an amorphous powder resembling indigo. Source: Websters Dictionary (01 Mar 1998) |
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| xylite | <chemistry> A liquid hydrocarbon found in crude wood spirits. Origin: Gr. Xylon wood. Source: Websters Dictionary (01 Mar 1998) |
| xylitol | <chemical> A five-carbon sugar alcohol derived from xylose by reduction of the carbonyl group. It is as sweet as sucrose. It is used as a noncariogenic sweetner and as a sugar substitute in diabetic diets. Chemical name: Xylitol (12 Dec 1998) |
| xylitol 5-phosphate dehydrogenase | <enzyme> Forms xylulose 5-phosphate Registry number: EC 1.1.1.- (26 Jun 1999) |
| xylitol dehydrogenase | <enzyme> An enzyme that reversibly converts xylulose to xylitol using either NADH (d-xylulose reductase) or NADPH (l-xylulose reductase); a deficiency of the l-form is seen in individuals with essential pentosuria. Synonym: xylitol dehydrogenase. (05 Mar 2000) |
| xylitone | <chemistry> A yellow oil having a geraniumlike odour, produced as a side product in making phorone. Synonym: xylite oil. Source: Websters Dictionary (01 Mar 1998) |
| xylo- | <prefix> A combining form meaning from wood; as in xylogen, xylograph. Origin: Gr. Xylon = wood (29 Oct 1998) |
| xylobalsamum | <medicine> The dried twigs of a Syrian tree (Balsamodendron Gileadense). Origin: NL, fr. Gr. Xylon wood + the balsam tree, balsam; cf. L. Xylobalsamum balsam wood, Gr. Source: Websters Dictionary (01 Mar 1998) |
| xylobiose | A disaccharide of two xylose residues linked b1→4, both in pyranose rings. (05 Mar 2000) |
| xylocarpous | <botany> Bearing fruit which becomes hard or woody. Origin: Xylo- + Gr. Karpos = fruit. Source: Websters Dictionary (01 Mar 1998) |
| xylocopa | <zoology> A genus of hymenopterous insects including the carpenter. See Carpenter bee, under Carpenter. Xyloc"opine. Origin: NL, fr. Gr. Cutting wood; xylon wood + to cut. Source: Websters Dictionary (01 Mar 1998) |
| xylogen | <botany> Nascent wood; wood cells in a forming state. Synonym: lignin. Origin: Xylo- + -gen. Source: Websters Dictionary (01 Mar 1998) |
| xyloglucan | <plant biology> Plant cell wall polysaccharide containing a backbone of _(1-4) linked glucose residues to most of which single xylose residues are attached as side chains. Galactose, fucose and arabinose may also be present in smaller amounts. It is the major hemicellulose of dicotyledonous primary walls and acts as a food reserve in some seeds. (18 Nov 1997) |
| xyloglucan 2-fucosyltransferase | <enzyme> Adds 1,2-alphafucosyl units to plant xyloglucans Registry number: EC 2.4.1.- Synonym: GDP-fucose-xyloglucan 1,2-alpha-l-fucosyltransferase (26 Jun 1999) |
| xyloglucan 2-galactosyltransferase | <enzyme> Attaches galactose in a 1,2-beta-linkage to xylosyl side chains that are linked 1,6-alpha- to the 1,4-beta-glucan backbone of plant xyloglucans Registry number: EC 2.4.1.- Synonym: xg galactosyltransferase (26 Jun 1999) |
| xysma |
(xys
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| xiphoiditis |
(xiph
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| xiphopagus |
(xi
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| xylene |
(xy
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| xylitol |
(xy
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| X | freshwater fish of Central America having a long swordlike tail |
|---|---|
| X | plants of tropical to temperate regions |
| X | an order of monocotyledonous herbs |
| X | chiefly American marsh plants, having usually yellow flowers |
| X | of Australia |
| X | (genetics) abnormal complement of sex hormones in a male who has two Y chromosomes |