Webster's Revised Unabridged Dictionary · 1913

Sagittarius

Sagittarius , noun

[Latin, literally, an archer, from sagittarius belonging to an arrow, from sagitta an arrow.]

(a)
(Astronomy) The ninth of the twelve signs of the zodiac, which the sun enters about November 22, marked thus [S] in almanacs; the Archer.
(b)
(Astronomy) A zodiacal constellation, represented on maps and globes as a centaur shooting an arrow.