Definition of notonectid in US English:

notonectid

noun

Entomology
  • A predatory aquatic bug of the family Notonectidae; a backswimmer.

adjective

Entomology
  • 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.

Pronunciation

notonectid

/ˌnəʊtə(ʊ)ˈnɛktɪd/