of or pertaining to winter; wintry.

1620–30; < Latin hībernālis, equivalent to hībern(us) wintry + -ālis -al1; akin to hiems winter (see hiemal)

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World English Dictionary
hibernal (haɪˈbɜːnəl)
of or occurring in winter
[C17: from Latin hībernālis, from hiems winter]

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Example sentences
Two dormancy mechanisms that many insects possess are diapause and hibernal quiescence.
The depth of the hibernal carpet varied from two inches to two feet.
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