1. materinus — de Vaan
materinus 'rough, unused' (Cato). Pit *mater, *matr-. It. cognates: FaL mate [nom.sg.], O. maatreis, U. matres, matrer [gen.sg.], SPic. matereih [datsg.?] 'mother1. PIE *meh2-tr- 'mother'. IE cognates: Skt matar-, Av. matar-, MoP madar, Gr. μήτηρ, Arm. mayr 'mother', Alb. meter 'sister', Lith. mote^ OCS mati, OHG muoter, Olr. maithir, ToB macer, To A piacar 'mother'. * The noun matertera contains the comparative … — [de Vaan, s.v. materinus, p. 381]