Etymology
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hibernal (adj.)

1620s (figurative), "pertaining to the later years of life;" literal sense "pertaining to winter" attested from 1640s; from Latin hibernalis "wintry," from hibernus "of winter," from hiems "winter," from PIE root *gheim- "winter."  

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Definitions of hibernal

hibernal (adj.)
characteristic of or relating to winter;
Synonyms: brumal / hiemal
From wordnet.princeton.edu