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Webster 1913 Edition
Hibernaculum
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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.
2.
(Zool.)
A little case in which certain insects pass the winter.
3.
Winter home or abiding place.
J. Burroughs.