Yolk

Yolk

(ylk or yk; 277), n. [OE. yolke, yelke, olke, elke, AS. geoloca, geoleca, fr. geolu yellow. See Yellow.]
[Written also yelk.]

[1913 Webster]

1. The yellow part of an egg; the vitellus.
[1913 Webster]

2. (Zol.) An oily secretion which naturally covers the wool of sheep.
[1913 Webster]

Yolk cord (Zol.), a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids. -- Yolk gland (Zol.), 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.
[1913 Webster]

 

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Wed 19th December 2018