plural noun
Platy·​som·​i·​dae | \-sōm-\

Definition of Platysomidae 

: a family of Carboniferous and Permian ganoid fishes (order Archistia) having a deep compressed body covered with rhombic scales joined by peg-and-socket joints

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History and Etymology for Platysomidae

New Latin, from Platysomus, type genus (from Greek platysōmos broad-bodied, from platy- + sōma body) + -idae

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to enclose within walls

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