Lewis & Short

trītūra, ae, f. [tero], a rubbing, wearing off, chafing.

  1. * I. In gen.: muli pectora copulae sparteae triturā continuā exulcerati, App. M. 9, p. 222, 39.
  2. II. In partic., a threshing, of grain, Varr. L. L. 5, § 21 Müll.; Verg. G. 1, 190; Col. 2, 19, 1; 1, 6, 23.