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

1. 1.1as genitive Trianguli /trīˈaNGɡyəlē, -ˌlī/ Used with preceding letter or numeral to designate a star in the constellation Triangulum.
   与其前面的字母或数字连用以标记该星座中的星三角星座的
   the star Beta Trianguli

   三角座β星。