Definitions for vitellusvɪˈtɛl əs, vaɪ-
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Random House Webster's College Dictionary
vi•tel•lusvɪˈtɛl əs, vaɪ-(n.)(pl.)-lus•es.
an egg yolk.
Origin of vitellus:
1720–30; < L
Princeton's WordNet
yolk, vitellus(noun)
nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)
Webster Dictionary
Vitellus(noun)
the contents or substance of the ovum; egg yolk. See Illust. of Ovum
Vitellus(noun)
perisperm in an early condition
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"vitellus." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/vitellus>.

