Lewis & Short

incīsūra, ae, f. [2. incīdo], a cutting into, incision, incisure (post-Aug.).

  1. I. In gen., Col. 12, 54, 1; Plin. 11, 39, 94, § 231.
    Plur., Vulg. Lev. 21, 5.
  2. II. In partic.
    1. A. A natural incision, indentation; as in the palm of the hand, the bodies of insects, in leaves, etc., Plin. 11, 52, 114, § 274; 11, 1, 1, § 1; 15, 11, 11, § 37; 26, 8, 29, § 46.
    2. B. In painting, a division between the light and shade, Plin. 33, 13, 57, § 163.