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.

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