Definition of obtriangular in US English:

obtriangular

adjective

Botany Zoology
  • Triangular in form, with the apex downwards or at the base.

Origin

Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From ob- + triangular.

Pronunciation

obtriangular

/ɒbtrʌɪˈaŋɡjʊlə/