plural noun
Coe·lo·pi·dae | \ sə̇ˈlōpəˌdē , sē- \

Definition of Coelopidae 

: a small family of acalyptrate muscoid flies that have flattened bodies and frequent seashores — see kelp fly

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History and Etymology for Coelopidae

New Latin, from Coelopa, type genus (from coel- + -opa, from Greek ōp-, ōps face, eye) + -idae

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occurring twice a year or every two years

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