| 单词 | first cross |
| 释义 | > as lemmasfirst cross first cross n. (in animal and plant breeding) the initial cross (cross n. 28a) between two different breeds of animal or varieties or species of plant; an instance of this; an animal or plant resulting from such a cross (cf. F1 at F n. Initialisms 1i). ΘΚΠ the world > animals > domestic animal > [noun] > livestock > stock or breed > cross-breed > of two pure breeds first cross1793 the world > life > biology > biological processes > genetic activity > heredity or hereditary descent > [noun] > cross-breeding or hybridism > hybrid or cross mongrel1558 hybrid1601 centaur1606 mulatto1664 half-strain1673 cross1761 cross-breed1774 first cross1793 double-cross1810 quadroon1811 intercross1859 outcross1882 reciprocal1901 filial generation1902 monohybrid1902 vicinist1905 first filial (or F₁) generation1909 polyhybrid1910 back-cross1919 second filial (or F₂) generation1938 1793 Ann. Agric. 19 91 (note) It deserves notice, however, that the horns go at the first cross. 1862 W. Youatt Sheep (new ed.) vii. 260 The first cross evidently detracted much from the beauty of the English sheep. 1910 T. Allen Profitable Pig Breeding ii. 13 A first cross of pure-bred stock, judiciously selected, is hard to beat. 1947 J. Stevenson-Hamilton Wild Life S. Afr. xxi. 165 The two best dogs..I ever possessed..were a first-cross between a pointer and a bull-terrier, and a first-cross between Great Dane and Irish terrier. 2000 Land (N. Richmond, New S. Wales) 1 June 9/4 They run 3200 Merino ewes, using Border Leicester rams to produce first cross lambs. < as lemmas |
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