-təˌdē noun plural
Usage: capitalized
Etymology: New Latin, from Notonecta, type genus (from not- (I) + -necta swimmer, from Greek nēktēs, from nēchein to swim) + -idae — more at neso-
: 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