Tau·rus / ˈtôrəs/ 1. Astron. a constellation (the Bull), said to represent a bull with brazen feet that was tamed by Jason. Its many bright stars include Aldebaran (the bull's eye), and it contains the Crab Nebula and the star clusters of the Hyades and the Pleiades. ∎ [as genitive] (Tau·ri / ˈtôrī/ ) used with a preceding letter or numeral to designate a star in this constellation: the star Beta Tauri.2. Astrol. the second sign of the zodiac, which the sun enters on about April 21. ∎ (a Taurus) (pl. same) a person born when the sun is in this sign.DERIVATIVES: Tau·re·an / ˈtôrēən; tôˈrēən/ n. & adj. (in sense 2).