Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕ-nĭtĕo, ēre, 2, v. n., to shine back, flash (eccl. Lat.), Ambros. de Fide, 2, 14 al.
rĕ-nītor, nīti, v. dep. n., to strive or struggle against, to withstand, resist (rare and not ante-Aug.; syn.: resisto, adversor, reluctor).