| xylan | <plant biology> Plant cell wall polysaccharide containing a backbone of _(1-4) linked xylose residues. Side chains of 4 O methylglucuronic acid and arabinose are present in varying amounts (see glucuronoxylan and arabinoxylan), together with acetyl groups. Found in the hemicellulose fraction of the wall matrix. (18 Nov 1997) |
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| xylans | Polysaccharides consisting of xylose units. (12 Dec 1998) |
| xylanthrax | Wood coal, or charcoal; so called in distinction from mineral coal. Origin: Gr. Xylon wood + coal. Source: Websters Dictionary (01 Mar 1998) |
| xylate | <chemistry> A salt of xylic acid. Source: Websters Dictionary (01 Mar 1998) |
| xylazine | <chemical> Proposed as sedative, analgesic, and muscle relaxant in cattle. Chemical name: 4H-1,3-Thiazin-2-amine, N-(2,6-dimethylphenyl)-5,6-dihydro- (12 Dec 1998) |
| xylem | <plant biology> Plant tissue in vascular plants that carries water and nutrients up from the roots to the shoot and leaves. Contains tracheids, vessels, fibre cells and parenchyma. Also provides structural support for the plant, especially in wood. (18 Nov 1997) |
| xylene | <chemistry> Any of a group of three metameric hydrocarbons of the aromatic series, found in coal and wood tar, and so named because found in crude wood spirit. They are colourless, oily, inflammable liquids, C6H4.(CH3)2, being dimethyl benzenes, and are called respectively orthoxylene, metaxylene, and paraxylene. Synonym: xylol. Each of these xylenes is the nucleus and prototype of a distinct series of compounds. Origin: Gr. Xylon wood. Source: Websters Dictionary (01 Mar 1998) |
| xylene cyanol FF | An acidic triphenylmethane dye used for histochemical staining of haemoglobin peroxidase and as a tracking dye for DNA sequencing in electrophoresis. (05 Mar 2000) |
| xylene monooxygenase | <enzyme> Coded by the tol plasmid of pseudomonas putida, oxidises the methyl side chain of toluene and xylenes Registry number: EC 1.14.13.- (26 Jun 1999) |
| xylenes | A family of isomeric, colourless aromatic hydrocarbon liquids, that contain the general formula c6h4(ch3)2. They are produced by the destructive distillation of coal or by the catalytic reforming of petroleum naphthenic fractions. (12 Dec 1998) |
| xylenol | <chemistry> Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH. Origin: Xylene + -ol. Source: Websters Dictionary (01 Mar 1998) |
| xyletic | <chemistry> Pertaining to, or designating, a complex acid related to mesitylenic acid, obtained as a white crystalline substance by the action of sodium and carbon dioxide on crude xylenol. Source: Websters Dictionary (01 Mar 1998) |
| xylic | <chemistry> Pertaining to, derived from, or related to, xylene; specifically, designating any one of several metameric acids produced by the partial oxidation of mesitylene and pseudo-cumene. Source: Websters Dictionary (01 Mar 1998) |
| xylidic | <chemistry> Pertaining to, or designating, either one of two distinct acids which are derived from xylic acid and related compounds, and are metameric with uvitic acid. Source: Websters Dictionary (01 Mar 1998) |
| xylidine | <chemistry> Any one of six metameric hydrocarbons, (CH3)2.C6H3.NH2, resembling aniline, and related to xylene. They are liquids, or easily fusible crystalline substances, of which three are derived from metaxylene, two from orthoxylene, and one from paraxylene. They are called the amido xylenes. The xylidine of commerce, used in making certain dyes, consists chiefly of the derivatives of paraxylene and metaxylene. Source: Websters Dictionary (01 Mar 1998) |
| xerotic |
(xe
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| xerostomia |
(xe
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| xiphocostal |
(xipho
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| xiphodynia |
(xiph
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| xiphoid |
(xiph
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| X | carpenter bees |
|---|---|
| X | a colorless flammable volatile liquid hydrocarbon used as a solvent |
| X | small species of Australian trees or shrubs |
| X | tree bearing pear-shaped fruit with a thick woody epicarp |
| X | a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators |
| X | someone who plays a xylophone |
| X | tropical evergreen trees or shrubs |
| X | tropical west African evergreen tree bearing pungent aromatic seeds used as a condiment and in folk medicine |
| X | a sugar extracted from wood or straw |
| X | shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers |
| X | shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers |
| X | swordtails |