Yolk-sac Definition

noun
A saclike vascular membrane containing yolk, an outgrowth from the ventral surface of very yolky vertebrate embryos, as those of fishes, birds, or reptiles, that supplies nourishment to the embryo.
Webster's New World
A homologous organ in most mammalian embryos that contains no yolk and that becomes a vestige at an early embryonic stage.
Webster's New World
Synonyms:
vesicula umbilicusumbilical vesiclevitelline sac

Other Word Forms of Yolk-sac

Noun

Singular:
yolk-sac
Plural:
yolk sacs
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yolk-sac