Etymology
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yolk (n.)

Old English geolca, geoloca "yolk," literally "the yellow part," from geolu "yellow" (see yellow (adj.)). Formerly also spelled yelk.

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Definitions of yolk

yolk (n.)
the yellow spherical part of an egg that is surrounded by the albumen;
Synonyms: egg yolk
yolk (n.)
nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg);
Synonyms: vitellus
From wordnet.princeton.edu