plural noun No·to·nec·ti·dae \-təˌdē\

Definition of Notonectidae

  1. :  a family of aquatic carnivorous insects (order Hemiptera) having the back strongly convex and the hind legs long and resembling oars and habitually swimming back downward

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Origin and Etymology of notonectidae

New Latin, from Notonecta, type genus (from 1not- + -necta swimmer, from Greek nēktēs, from nēchein to swim) + -idae — more at neso-

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a rounded knoll or a ridge of ice

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