Definitions for: Yolk

[n] nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)

Webster (1913) Definition: Yolk (y[=o]lk or y[=o]k; 277), n. [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.

Synonyms: vitellus

See Also: egg, food, nutrient

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