Words That Rhyme With "Mediastinum" :
2 syllables:
annum, beeman, crinum, daemon, deman, demon, denim, freeman, frenum, genome, gleeman, granum, greenman, heman, Keenan, leaman, leeman, Lehman, leman, minim, mnemon, paynim, phenom, plenum, queendom, Riemann, seaman, seamen, semen, venom, Zeeman, Zeman
3 syllables:
envenom, eudemon, extremum, glucinum, Houyhnhnm, jejunum, machinegun, Palaemon, solanum, tablinum, trigonum