plural noun
Ce·​to·​mim·​i·​dae | \ -ˈmiməˌdē\

Definition of Cetomimidae 

: a family of small feeble degenerate deep-sea fishes (order Iniomi) resembling whales in shape and in having smooth black skin

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History and Etymology for Cetomimidae

New Latin, from Cetomimus, type genus (from cet- + -mimus) + -idae

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