From ZooTerms (Dictionary of Invertebrate Zoology)
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ovisac (noun; Latin ovum, egg; saccus, bag): 1. An egg capsule, brood pouch, or receptacle.

2. (Arthropoda: Crustacea) In female Copepoda, the external sac attached to the somite that bears the openings of the gonoducts.

3. (Arthropoda: Insecta) In coccids, the envelope in which eggs are laid; the ovarial cavity in which the eggs are stored.