carcinoecium
noun
car·ci·noe·ci·um
ˌkärsəˈnēs(h)ēəm
plural carcinoecia
-s(h)ēə
: a colony of zoanthidean anemones (genus Epizoanthus) enclosing a hermit crab after dissolving the shell in which the crab lodged
Word History
Etymology
New Latin, from carcin- + -oecium (from Greek oikion house, nest, diminutive of oikos house)