Lewis & Short

buccŭla (būcŭla), ae, f. dim. [bucca].

  1. I. A little cheek or mouth, * Suet. Galb. 4: pressa Cupidinis buccula, App. M. 6, p. 182, 17; 3, p. 137, 40; Arn. 2, p. 73.
  2. II. In milit. lang.
    1. A. The beaver, that part of a helmet which covers the mouth and cheeks, παραγναθίς: bucculas tergere, Liv. 44, 34, 8; Juv. 10, 134; Capitol. Max. Jun. 3; Cod. Th. 10, 22, 1.
    2. B. Bucculae, two cheeks, one on each side of the channel in which the arrow of the catapulta was placed, Vitr. 10, 15, 3.