Lewis & Short

săgittārĭus, a, um, adj. [sagitta].

  1. I. Of or belonging to an arrow, arrow-: calamus, good for making arrows, Plin. 16, 36, 66, § 166: certamen, with arrows, Dict. Cret. 4, 19.
  2. II. Subst.: săgittārĭus, ii, m.
    1. A. An archer, bowman, a sort of light-armed troops, both foot and horse; usually in the plur., Caes. B. G. 2, 7; 2, 10; 2, 19; 7, 31; Sall. J. 46, 7; Cic. Phil. 5, 6, 18; id. Att. 5, 20, 5; id. Fam. 15, 4, 10; Amm. 29, 5, 22.
      In sing., collect.: levis armatura cum equite sagittario, Tac. A. 2, 16 fin.; 13, 40.
    2. B. săgittārii, ōrum, m., arrow-makers, arrow-smiths, Dig. 50, 6, 7.
    3. C. The constellation Sagittarius, or the Archer (otherwise called Arcitenens], Cic. Arat. 525; Hyg. Fab. 124; id. Astr. 2, 27; 3, 26; Plin. 17, 24, 36, § 215; 30, 11, 29, § 97.