Definition of Triangulum in English:

Triangulum

proper noun

Astronomy
  • 1A small northern constellation (the Triangle), between Andromeda and Aries.

    1. 1.1Used with preceding letter or numeral to designate a star in this constellation.
      ‘the star Beta Trianguli’

Origin

Latin.

Pronunciation:

Triangulum

/trʌɪˈaŋɡjʊləm/