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From The Collaborative International Dictionary of English v.0.48:
Hibernaculum \Hi`ber*nac"u*lum\, n. [See Hibernacle.] 1. (Bot.) A winter bud, in which the rudimentary foliage or flower, as of most trees and shrubs in the temperate zone, is protected by closely overlapping scales. [1913 Webster] 2. (Zool.) A little case in which certain insects pass the winter. [1913 Webster] 3. Winter home or abiding place. --J. Burroughs. [1913 Webster]