Ptomaine rhymes with:
tremayne, baudoin, boatswain, chapdelaine, chilblain, cyclohexane, duplechain, finucane, hexane, ibogaine, lamountain, madelaine, moscowane, octane, ramtane, tremayne
Ptomaine sounds like:
padden, paden, paduano, patane, pathan, patin, patina, patino, patman, paton, patten, pattin, patton, payton, peaden, peden, pedone, peedin, pepitone, petain, petino, petition, pettine, petunia, peyton, photon, pipitone, pitino, pitman, pitney, pittman, podany, podium, poten, potion, ptyon, put-on, putdown, putman, putnam, putney, puttnam, python