-adelphous

borrowed from New Latin -adelphus, borrowed from Greek -adelphos (as in oligádelphos "having few siblings,"), derivative of adelpheós, adelphós "brother" and adelpheḗ, adelphḗ "sister," from a- (variant, before a following aspirate consonant, of ha- "having one, having the same," going back to Indo-European sm̥-) + -delphe-, derivative from the base of delphýs "womb" — more at acolyte, dolphin