noun, plural hi·ber·nac·u·la [hahy-ber-nak-yuh-luh] /ˌhaɪ bərˈnæk yə lə/.

  1. a protective case or covering, especially for winter, as of an animal or a plant bud.
  2. winter quarters, as of a hibernating animal.

noun plural -ula (-jʊlə) or -les rare

  1. the winter quarters of a hibernating animal
  2. the protective case or covering of a plant bud or animal

“winter residence,” 1708, from Latin hibernaculum “winter residence, winter quarters,” related to hibernare “to winter” (see hibernation) with instrumentive suffix -culum. Related: Hibernacular.

  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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