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Meaning of hibernaculum

hi•ber•nac•u•lum

Pronunciation: (hī"bur-nak'yu-lum), [key]
— pl. -la
  1. a protective case or covering, esp. for winter, as of an animal or a plant bud.
  2. winter quarters, as of a hibernating animal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.