Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
glădĭātūra, ae, f. [gladius, gladiator], a fighting of gladiators, or their profession (post-Aug. and very rare): adduntur e servitiis gladiaturae destinati, Tac. A. 3, 43: ut requiem gladiaturae haberet, Schol. Juv. 6, 105; Firm. 5, 27.