perpĕtrātor, ōris, m. [perpetro],
a performer , committer , perpetrator (post-class.): peccati, Aug. Civ. Dei, 20, 1: caedis infaustae, Sid. Ep. 8, 6.
·noun One who perpetrates; ·esp., one who commits an offense or crime. ...
Webster's Dictionary of the English Language