fraternal
fra.ter.nal \fr*-'t*rn-*l\ \-*l-.iz-*m\ \-*l-e-\ aj [ME, fr. ML fraternalis, fr. L fraternus fr. frater brother] 1a: of, relating to, or involving brothers 1b: of, relating to, or being a fraternity or society 2: derived from two ova : DIZYGOTIC 3: FRIENDLY, BROTHERLY - fra.ter.nal.ism n