notonectid
/ˌnəʊtə(ʊ)ˈnɛktɪd/Entomology
noun
A predatory aquatic bug of the family Notonectidae; a backswimmer.
adjective
Of, relating to, or designating a bug of the family Notonectidae.
Origin
Early 20th century; earliest use found in Science. From scientific Latin Notonectidae, family name (Latreille 1802) from Notonecta + -idae.