IPA: /hɪˈbɜrnəˌkjʊləm/
KK: /hɪˈbɜrnəˌkjuləm/
A place where an animal or plant stays safe and inactive during the winter months.
The bear found a warm hibernaculum to sleep in during the cold season.
Hibernaculum → It is formed from "hiberna" (from Latin "hibernare", meaning to spend the winter) and "-culum" (a diminutive suffix in Latin, meaning a small place). The word "hibernaculum" refers to a small place where an animal hibernates or spends the winter.
Think of a small 'place' ('-culum') where animals 'spend the winter' ('hiberna') — that's what a hibernaculum is.