Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
trŭtĭnātor, ōris, m. [trutinor], a weigher; only trop., one who examines, judges: ut civilia negotia aequus trutinator examines, Cassiod. Var. 6, 23; Ennod. Epigr. 1, 1; 2, 19.