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vitellus
From The Collaborative International Dictionary of English v.0.48:
Vitellus \Vi*tel"lus\, n. [L., the yolk of an egg.]
[1913 Webster]
1. (Biol.) The contents or substance of the ovum; egg yolk.
See Illust. of Ovum.
[1913 Webster]
2. (Bot.) Perisperm in an early condition.
[1913 Webster]
