vitellarium

noun
vi·​tel·​lar·​i·​um | \ ˌvīt-ᵊl-ˈar-ē-əm How to pronounce vitellarium (audio) \
plural vitellaria\ -​ē-​ə How to pronounce vitellaria (audio) \

Medical Definition of vitellarium

: 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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