One of the mysteries of the English language finally explained.
A predatory aquatic bug of the family Notonectidae; a backswimmer.
Of, relating to, or designating a bug of the family Notonectidae.
Early 20th century; earliest use found in Science. From scientific Latin Notonectidae, family name (Latreille 1802) from Notonecta + -idae.
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