plural noun
Prot·​ephemerida | \ (¦)prōt+\

Definition of Protephemerida

: an order of extinct insects related to the Ephemeroptera, known only from the Upper Carboniferous, and characterized by long cerci and homonomous wings with numerous crossveins

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History and Etymology for Protephemerida

New Latin, from prot- + Ephemerida

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to reflect, repel, echo, or resound

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