In the eggs of birds and reptiles: the yellow internal part of the egg, which is surrounded by the white or albumen, is rich in protein and fat…
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| 单词 | θ18935 |
| 释义 | the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid > yolk (35) yolkeOE In the eggs of birds and reptiles: the yellow internal part of the egg, which is surrounded by the white or albumen, is rich in protein and fat… spring1600 Perhaps: a yolk. Obsolete. rare. vitellary1650 The place or part where the yolk of an egg is formed. Obsolete. vitellus1728 Embryology. The yolk of an egg; the germinative contents of an ovum-cell. food-yolk1850 the part of the yolk in an animal egg which provides nutrients for the embryo; the nutritive yolk (cf. yolk, n.1 1c). vitellin1857 The albuminoidal substance in the yolk of egg, a mixture of albumin and casein. trophoblast1886 Nutritive substance or tissue (perhaps yolk) within a developing ovum. Cf. tropholecithus n. at tropho-, comb._form affix 1. Obsolete. rare. vitelline1891 The yolk, the vitellary substance. ovovitellin1906 = vitellin, n. 1. Subcategories:— formation of (1) — vitellophag (1) — types of yolk (4) — sac (4) — tread (12) — yolk duct (2) — lutein, etc. (2) |
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