Lewis & Short

1. suffrāgo, ĭnis, f. [sub-frag, frango].

  1. I. Lit., the ham or hough, hock of a quadruped’s hind leg (opp. armus): articulum suffraginis contingere (cf. poples), Plin. 8, 45, 70, § 183: suffraginum artus in aversum flectunt, id. 11, 45, 101, § 248; Col. 6, 15, 2.
    Rarely of birds: aves ut quadripedes alas in priora curvant, suffraginem in posteriora, Plin. 11, 45, 102, § 249: aquilae pedes evellunt in aversum a suffragine, id. 30, 6, 18, § 54.
  2. II. Transf., a shoot, spray of a vine: suboles, quam rustici suffraginem vocant, Col. 4, 24, 4.