| quincuncial | Of the arrangement of corolla lobes in a bud, a variant of imbricate aestivation. (09 Oct 1997) |
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| quincunx | 1. An arrangement of things by fives in a square or a rectangle, one being placed at each corner and one in the middle; especially, such an arrangement of trees repeated indefinitely, so as to form a regular group with rows running in various directions. 2. <astronomy> The position of planets when distant from each other five signs, or 150 deg . 3. <botany> A quincuncial arrangement, as of the parts of a flower in aestivation. See Quincuncial. Origin: L, fr. Quingue five + uncia an ounce. The quincunx was marked by five small spots or balls. See Five, and Ounce the weight. Source: Websters Dictionary (01 Mar 1998) |
| quindecagon | <geometry> A plane figure with fifteen angles, and consequently fifteen sides. Origin: L. Quindecim fifteen + Gr. Angle. Source: Websters Dictionary (01 Mar 1998) |
| quindecone | <chemistry> An unsaturated hydrocarbon, C15H26, of the valylene series, produced artificially as an oily liquid. Alternative forms: quindekone. Origin: L. Quindecim fifteen. Source: Websters Dictionary (01 Mar 1998) |
| quindecylic | <chemistry> Pertaining to, or designating, an acid of the fatty acid series, containing fifteen atoms of carbon. Synonym: pentadecylic acid. Origin: L. Quindecim fifteen + -yl. Source: Websters Dictionary (01 Mar 1998) |
| quinestradiol | Quinestradol 3-(Cyclopentyloxy)estra-1,3,5(10)-triene-16a,17b-diol;an oestrogen. (05 Mar 2000) |
| quinestrol | <chemical> A synthetic form of oestrogenused in oral contraceptives. (09 Oct 1997) |
| quinethazone | 7-Chloro-2-ethyl-1,2,3,4-tetrahydro-4-oxo-6-quinazolinesulfonamide;a diuretic and antihypertensive agent. (05 Mar 2000) |
| quingestanol acetate | 3-(Cyclopentyloxy)-19-nor-17a-pregna-3,5-dien-20-yn-17-ol acetate;a progestational agent. (05 Mar 2000) |
| quinhydrone | <chemistry> A green crystalline substance formed by the union of quinone with hydroquinone, or as an intermediate product in the oxidation of hydroquinone or the reduction of quinone. Alternative forms: chinhydrone. Origin: Quinone + hydroquinone. Source: Websters Dictionary (01 Mar 1998) |
| quinhydrone electrode | One of several oxidation-reduction electrode's in which the ratio of the two forms (quinone-quinhydrone), determined by the hydrogen ion concentration, sets up a potential that can be measured and converted to a pH value (fails above pH 8). (05 Mar 2000) |
| quinia | <chemistry> Quinine. Source: Websters Dictionary (01 Mar 1998) |
| quinic | <chemistry> Pertaining to, derived from, or connected with, quinine and related compounds; specifically, designating a nonnitrogenous acid obtained from cinchona bark, coffee, beans, etc, as a white crystalline substance. Alternative forms: chinic, kinic. See: Quinine, and cf. Kinic. Source: Websters Dictionary (01 Mar 1998) |
| quinic acid | <chemical> An acid which is found in cinchona bark and elsewhere in plants. Chemical name: Cyclohexanecarboxylic acid, 1,3,4,5-tetrahydroxy-, (1R-(1alpha,3alpha,4alpha,5beta))- (12 Dec 1998) |
| quinicine | <chemistry> An uncrystallizable alkaloid obtained by the action of heat from quinine, with which it is isomeric. Source: Websters Dictionary (01 Mar 1998) |