noun, plural hibernacula [hahy-ber-nak-yuh-luh] .
a protective case or covering, especially for winter, as of an animal or a plant bud.
winter quarters, as of a hibernating animal.
Also, hibernacle [hahy-ber-nak-uhl] .

1690–1700; < Latin hībernāculum winter residence, equivalent to hībernā(re) (see hibernate) + -culum -cule2

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World English Dictionary
hibernaculum or hibernacle (ˌhaɪbəˈnækjʊləm, ˈhaɪbəˌnækəl)
n , pl -ula, -les
1.  the winter quarters of a hibernating animal
2.  the protective case or covering of a plant bud or animal
[C17: from Latin: winter residence; see hibernate]
hibernacle or hibernacle (ˌhaɪbəˈnækjʊləm, ˈhaɪbəˌnækəl, -jʊlə)
[C17: from Latin: winter residence; see hibernate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hibernaculum   (hī'-bər-nāk'yə-ləm)  Pronunciation Key 
  1. A protective case, covering, or structure, such as a plant bud, in which an organism remains dormant for the winter.

  2. The shelter of a hibernating animal.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The hibernaculum must also provide protection from light, noise, and predators.
The fungus may not be readily visible on the bats, especially after they leave
  the hibernaculum and groom themselves.
Landowner coordination for long-term protection of another important
  hibernaculum is under way.
Mating occurs directly before hibernation, but copulating pairs may be found in
  the hibernaculum throughout winter.
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