Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕfūtātĭo, ōnis, f. [refuto]; in rhet., a refutation, Cic. Top. 25, 93; Quint. 5, 13, 1; 3, 9, 5; 4, 3, 15; 6, 3, 72.