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

Definition of Protephemerida

  1. :  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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Origin and Etymology of protephemerida

New Latin, from prot- + Ephemerida

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