Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
trītūro, āre, v. a. [tritura, II.], to thresh (late Lat.): bos triturans, Vulg. 1 Cor. 9, 9: paleam areae, Aug. Tract. in Johan. 4, § 2: fruges, Isid. 15, 13, 16.
Trop.: passionum flagellis triturari, Sid. Ep. 7, 6 med.