(Astronomy)a small northern constellation (the Triangle), between Andromeda and Aries (天文)三角星座 ■[as genitive Trianguli Australis trʌɪˈangjʊliː]used with preceding letter or numeral to designate a star in this constellation [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。