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yolk 音标拼音: [j'ok] n. 蛋黄 蛋黄 yolk n 1: the yellow spherical part of an egg that is surrounded by the albumen [ synonym: { egg yolk}, { yolk}] 2: nutritive material of an ovum stored for the nutrition of an embryo ( especially the yellow mass of a bird or reptile egg) [ synonym: { yolk}, { vitellus}] Yolk \ Yolk\ ( y[= o] lk or y[= o] k; 277), n. [ OE. yolke, yelke, [ yogh] olke, [ yogh] elke, AS. geoloca, geoleca, fr. geolu yellow. See { Yellow}.] [ Written also { yelk}.] [ 1913 Webster] 1. The yellow part of an egg; the vitellus. [ 1913 Webster] 2. ( Zool.) An oily secretion which naturally covers the wool of sheep. [ 1913 Webster] { Yolk cord} ( Zool.), a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids. { Yolk gland} ( Zool.), a special organ which secretes the yolk of the eggs in many turbellarians, and in some other invertebrates. See Illust. of { Hermaphrodite} in Appendix. { Yolk sack} ( Anat.), the umbilical vesicle. See under { Unbilical}. [ 1913 Webster] |
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