vitellarium
noun
vi·tel·lar·i·um
ˌvīt-ᵊl-ˈar-ē-əm
plural vitellaria
-ē-ə
: a modified part of the ovary that in many flatworms and rotifers produces yolk-filled cells serving to nourish the true eggs
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Merriam-Webster unabridged
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