The Collaborative International Dictionary of English v.0.48:
Hibernate \Hi"ber*nate\, v. i. [imp. & p. p. Hibernated; p. pr. & vb. n. Hibernating.] [L. hibernare, hibernatum, fr. hibernus wintry. See Hibernal.] To winter; to pass the season of winter in close quarters, in a torpid or lethargic state, as certain mammals, reptiles, and insects. [1913 Webster] Inclination would lead me to hibernate, during half the year, in this uncomfortable climate of Great Britain. --Southey. [1913 Webster]