Sag·it·tar·i·us / ˌsajiˈte(ə)rēəs/ 1. Astron. a large constellation (the Archer), said to represent a centaur carrying a bow and arrow. The center of the Galaxy is situated within it. ∎  [as genitive] (Sag·it·tar·i·i / -ˈte(ə)rē-ˌī/ ) used with a preceding letter or numeral to designate a star in this constellation: the star Mu Sagittarii.2. Astrol. the ninth sign of the zodiac, which the sun enters about November 22. ∎  (a Sagittarius) (pl. same) a person born when the sun is in this sign.DERIVATIVES: Sag·it·ta·ri·an / -ˈte(ə)rēən/ n. & adj. (in sense 2).

Sagittarius a large constellation (the Archer), said to represent a centaur carrying a bow and arrow. In astrology, the ninth sign of the zodiac, which the sun enters about 22 November; a person born between 22 November and 21 December is in astrological belief thought to be under its influence.

The name is Latin, from sagitta ‘arrow’.

Sagittarius (archer) Southern constellation between Scorpio and Capricorn. Rich in stellar clusters, this region of the sky also contains much interstellar matter. The brightest star is Epsilon Sagittarii (Kaus Australis), magnitude 1.8.

Sagittarius zodiacal constellation. XIV. — L. sagittārius archer, f. sagitta arrow; see -ARY.