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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Yolk \Yolk\ (y[=o]lk or y[=o]k; 277), noun [OE. yolke, yelke, [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu yellow. See {Yellow}.] [Written also {yelk}.]
1. The yellow part of an egg; the vitellus.
2. (Zo["o]l.) An oily secretion which naturally covers the wool of sheep.
{Yolk cord} (Zo["o]l.), a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids.
{Yolk gland} (Zo["o]l.), 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}.
From WordNet (r) 2.0 [wn]:
yolk
noun: nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg) [syn: {vitellus}]
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