Lewis & Short

bracchĭŏlum (brāch-), i, n. dim. [bracchium].

  1. I. A small, delicate arm: puellulae, * Cat. 61, 181.
  2. II. Transf.
    1. A. A muscle in a horse’s leg, Veg. 1, 25, 4 and 5; cf. id. 6, 1, 1; 6, 2, 2; 5, 27, 7; 5, 70, 2.
    2. B. The arm of a chair or seat, Vulg. 2 Par. 9, 18.