slovodefinícia
Yolk cord
(gcide)		Yolk \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.]
[1913 Webster]
1. The yellow part of an egg; the vitellus.
[1913 Webster]

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

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.
[1913 Webster]
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