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vitellus n. 蛋黄 蛋黄 vitellus n 1: 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}] Vitellus \Vi*tel"lus\, n. [L., the yolk of an egg.]
[1913 Webster] 1. (Biol.) The contents or substance of the ovum; egg yolk. See Illust. of {Ovum}. [1913 Webster] 2. (Bot.) Perisperm in an early condition. [1913 Webster]
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