ˌhībə(r)ˈnakyələm noun
( plural hibernacu·la -lə)
Etymology: New Latin, from Latin, winter residence, from hibernus of winter, wintry + -culum -cle — more at hibernate
1. : the winter resting part of a plant (as a bud or underground stem)
2.
a. : a shelter that is occupied during the winter by a dormant insect or other animal and that usually has a characteristic structure for each species — called also hibernacle
b. : an encysted bud in a freshwater bryozoan that survives the winter and develops into a colony in the spring
c. : the epiphragm of a snail