carcinoecium

noun
car·ci·noe·ci·um | \ ˌkärsəˈnēs(h)ēəm \
plural carcinoecia\-s(h)ēə \

Definition of carcinoecium 

: a colony of zoanthidean anemones (genus Epizoanthus) enclosing a hermit crab after dissolving the shell in which the crab lodged

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History and Etymology for carcinoecium

New Latin, from carcin- + -oecium (from Greek oikion house, nest, diminutive of oikos house)

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