01 n. The yellow part of an egg; the vitellus.
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1.
The yellow part of an egg; the vitellus.
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2.
An oily secretion which naturally covers the wool of sheep.(Zool.)
Phrases & compounds
Yolk cord —
a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids.
Yolk gland —
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 —
the umbilical vesicle. See under Unbilical.