Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
turpīdo, ĭnis, f. [contr. from turpidudo], baseness, etc., Tert. Cor. Mil. 14; Cic. Rep. 1, 2, 2 MSS. (B. and K. turpitudinis; cf. Osann ad loc.).