Definition of noctua in US English:

noctua

noun

Entomology
  • A noctuid moth, especially one of the genus Noctua (subfamily Noctuinae), which includes the yellow underwings. Now chiefly (in form Noctua): the genus itself.

Origin

Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From classical Latin noctua night owl, use as noun of feminine of an unattested adjective from noct-, nox night + -uus, suffix forming adjectives.

Pronunciation

noctua

/ˈnɒktjʊə/