Lewis & Short

1. căpella, ae, f. dim. [caper; cf.: puer, puella], a she-goat.

  1. I. Lit., Col. 7, 6, 4; Cat. 19, 16; 20, 10; Tib. 1, 1, 31; Verg. E. 7, 3; 10, 7; Hor. Epod. 16, 49; id. S. 1, 1, 110; id. Ep. 1, 7, 86; Ov. M. 13, 691 al.
    A piece of statuary, Cic. Verr. 2, 2, 35, § 87.
      1. 2. As a term of reproach, a dirty fellow, Amm. 17, 12; 24, 8 (cf. canicula).
  2. II. A star on the left shoulder of the constellation Auriga (usu. called capra), Plin. 18, 26, 66, § 248; rising in the rainy season; hence, sidus pluviale capellae, Ov. M. 3, 594: signum pluviale, id. F. 5, 113.