From ZooTerms (Dictionary of Invertebrate Zoology)
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vitellarium (noun; plural -ia; Latin vitellus, yolk; -arium, place for): 1. A yolk gland; a zone of growth.

2. (Arthropoda: Insecta) That part of an ovariole that contains the developing eggs.

3. (Platyhelminthes) Glands which produce yolk material and possibly the eggshell.