From ZooTerms (Dictionary of Invertebrate Zoology)
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hibernaculum (noun; plural hibernacula; Latin hibernaculum, winter residence): 1. A case or covering.

2. (Bryozoa) Winter bud in a few freshwater forms that survive the winter and form a new colony in the spring.

3. (Arthropoda: Insecta) A case or covering in which larvae hide or hibernate; a winter cocoon.