plural noun
Cu·cu·ma·ri·idae | \ ˌkyük(y)əməˈrīəˌdē \

Definition of Cucumariidae 

: a large family of shallow-water sea cucumbers (order Dendrochirota) having a number of intricately branched oral tentacles, an internal madreporite, and a well-developed respiratory tree

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History and Etymology for Cucumariidae

New Latin, from Cucumaria, type genus + -idae

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occurring twice a year or every two years

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