Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
asprĭtūdo (asperĭtūdo, App. M. 1, p. 103, 20), ĭnis, f. [asper], roughness: modo circa totum corpus partemve aspritudo quaedam fit, Cels. 5, 28, 15: aspritudo oculorum, id. 6, 6, 26; 7, 7, 15 Daremb. al.