Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-normo, no perf., ātum, 1, v. a. [norma], to disfigure, to make irregular or crooked (very rare): angulus, qui nunc denormat agellum, Hor. S. 2, 6, 9: linea denormata, Auct. de Lim. p. 252 Goes.