I.of or belonging to an addition made to a sacrifice (ante-class.): magmentum a magis, quod ad religionem magis pertinet; “itaque propter hoc magmentaria fana instituta locis certis, quo id imponeretur,” Varr. L. L. 5, § 112 Müll.—Hence, subst.: magmentārĭum , i, n. (sc. sacellum), a sanctuary for additional sacrifices: “putant enim ad me non nulli pertinere magmentarium Telluris aperire,” Cic. Har. Resp. 14, 31: magmentarium ἐφ̓ οὗ τὰ σπλάγχνα ἀνατιθέμενα τοῖς βωμοῖς προσφέρονται, Gloss. Philox.
magmentārĭus , a, um, adj. magmentum,