| 单词 | food-yolk |
| 释义 | > as lemmasfood-yolk food-yolk n. Zoology (now rare) the part of the yolk in an animal egg which provides nutrients for the embryo; the nutritive yolk (cf. yolk n.1 1c). ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid > yolk yolkeOE spring1600 vitellary1650 vitellus1728 food-yolk1850 vitellin1857 trophoblast1886 vitelline1891 ovovitellin1906 1850 R. Owen in Med. Times 30 Mar. 232/3 The yolk..is thus seen to consist of a germ-yolk and a food-yolk. 1889 Amer. Naturalist 23 412 The egg of the shrimp, like that of the hen or tortoise consists of a large mass of food-yolk, surrounding..the nucleus. 1926 R. S. Lull Org. Evol. xiii. 203 These posterior cells are generally somewhat larger than the anterior ones, especially in those embryos in which much food-yolk tends to concentrate. < as lemmas |
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