hibernal
Of the coldest season
Hibernal means of or relating to winter.
The word is the winter equivalent of vernal (spring), estival (summer), and autumnal (fall).
It appears mainly in literary or scientific contexts: the hibernal solstice, hibernal dormancy in insects.
Rare in everyday speech, where "winter" serves as its own adjective.
Feathery ice crystal
- icicleHanging frozen water spike
- blizzardViolent prolonged snowstorm
- frostThin ice coating
- sleetPartly frozen precipitation
flurry · snowbound · permafrost · tundra · glacier · solstice · fireplace · hearth
Inactive, sluggish state
- dormancySuspended biological activity
- quiescenceState of being inactive
- lethargyAbnormal drowsiness and apathy
- stasisState of inactivity
latency · slumber · rest · repose · suspension · inactivity · stillness · quietude
snowflake
Feathery ice crystal
sleet · flurry · snowbound · permafrost · tundra · glacier · solstice · fireplace · hearth · flannel
torpor
Inactive, sluggish state
- dormancySuspended biological activity
- quiescenceState of being inactive
- lethargyAbnormal drowsiness and apathy
stasis · latency · slumber · rest · repose · suspension · inactivity · stillness · quietude · aestivation
frigid
Extremely and intensely cold
glacial · gelid · chill · nippy · biting · bitter · crisp · numbing · shivery · subzero
solstice
Day of maximum tilt
hibernate, hibernating, hibernation, hibernates, hibernated, hibernator, hibernators, hibernations, hibernaculum