Entry 2 senses Webster, 1913

Vitellus

· Vi·tel·lus · IPA

01 n. The contents or substance of the ovum; egg yolk. See Illust. of Ovum.

1.
The contents or substance of the ovum; egg yolk. See Illust. of Ovum.(Biol.) See: Ovum
2.
Perisperm in an early condition.(Bot.)