Definitions for: Vitellus

[n] nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)

Webster (1913) Definition: Vi*tel"lus, n. [L., the yolk of an egg.]
1. (Biol.) The contents or substance of the ovum; egg yolk.
See Illust. of Ovum.

2. (Bot.) Perisperm in an early condition.

Synonyms: yolk

See Also: egg, food, nutrient