Lewis & Short

cūmătĭum, ii, v. cymatium.

† cȳmătĭum (cūm-) or -on, ii, n., = κυμάτιον (a small wave); in architecture,

  1. I. The volute of an Ionic column, Vitr. 3, 5, 7; 4, 1, 7.
  2. II. A channel, a waved moulding, an ogee, Vitr. 3, 5, 10; 4, 3, 6; 4, 3, 8; 4, 6, 2; Tert. Idol. 8.