GNU Collaborative International Dictionary of English

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1.       
   Yolk , n. [OE. yolke, yelke, ȝolke, ȝelke, AS. geoloca, geoleca, fr. geolu yellow. See Yellow.] [Written also yelk.]
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   The yellow part of an egg; the vitellus.
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   (Zool.) An oily secretion which naturally covers the wool of sheep.
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   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.
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