plural noun
Opis·​tho·​gnath·​i·​dae | \əˌpisthəˈnathəˌdē, -ˌthägˈn-\

Definition of Opisthognathidae 

: a family of large-mouthed percoid fishes with a large naked head and the body covered with small cycloid scales — see jawfish

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History and Etymology for Opisthognathidae

New Latin, from Opisthognathus, type genus, (from opisth- + -gnathus) + -idae

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to clear from alleged fault or guilt

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