1. n.1 the yellow internal part of an egg that nourishes the young before it hatches.
2 Biol. the corresponding part of any animal ovum.
Phrases and idioms:
yolk-bag (or -sac) a membrane enclosing the yolk of an egg.
Derivatives:
yolked adj. (also in comb.). yolkless adj. yolky adj.
Etymology: OE geol(o)ca f. geolu YELLOW 2. n. SUINT.
Etymology: OE eowoca (unrecorded)