Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† blasphēmĭa, ae, f. (blasphēmĭ-um, ii, n., Prud. Psych. 715), = βλασφημία (eccl. Lat.), a reviling, slander, Vulg. Isa. 51, 7; towards God, blasphemy, Hier. Ep. 62, n. 2; Aug. Verb. Dom. Serm. 11; 14; 15; Vulg. 2 Par. 32, 17; id. Matt. 26, 65.