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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    1. The yellow part of an egg; the vitellus.
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    2. (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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