Lewis & Short

parrĭcīdĭālis or parrĭcīdālis (parĭc-), e, adj. [parricida], pertaining to or producing the crime of parricide, parricidal, murderous: INSIDIATORES, Inscr. Boeckh. Corp. 2971: horror, Arn. 3, 116: manus, Prud. Ham. 14 praef.: scelus, Just. 27, 1, 10; cf. 27, 1, 2: discordiae, id. 39, 3, 1: bellum, i. e. the civil war, Flor. 3, 21: populus Judaeorum, Ambros. Cain et Abel, 1, 2, 5; Quint. Decl. 4, 19; 17, 18.
Adv.: parrĭcīdĭālĭter, murderously: perire, Lampr. Alex. Sev. 1; Aug. Ep. 168.