VITELLUS
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)
Source: WordNet® 3.1
Etymology
Noun
vitellus (countable and uncountable, plural vitelli or vitelluses)
(biology) The contents or substance of the ovum; egg yolk.
(botany) Perisperm in an early condition.
Source: Wiktionary
Vi*tel"lus, n. Etym: [L., the yolk of an egg.]
1. (Biol.)
Definition: The contents or substance of the ovum; egg yolk. See Illust. of Ovum.
2. (Bot.)
Definition: Perisperm in an early condition.
Source: Webster’s Unabridged Dictionary 1913 Edition
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