Pronunciation: (hī"bur-nak'yu-lum), [key]
—pl. -laPronunciation: (-lu). [key]
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. Also,hi•ber•nac•lePronunciation: (hī'bur-nak"ul). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.