Lewis & Short

caesūra, ae, f. [caedo]

  1. I. A cutting, felling, hewing, hewing off ligni, Plin. 16, 43, 84, § 230; silvae, id. 17, 20, 34, § 151
    1. B. Meton. (abstr. pro concr.), that which is hewn or cut off, Plin. 8, 26, 40, § 96.
  2. II. In metre, a pause in a verse, cœsura; called also incisio, Diom. p. 496 P.; Bed. Metr. p. 2368 ib.