Here's what rhymes with cselestium.
                        
                        
                    
                                Words that almost rhyme with cselestium
lesbian  thespian  requiem  barium  vivarium  fermium  millennium  gentium  biennium  lutetium  lawrencium  aquarium  proscenium  honorarium  nobelium  sanitarium  technetium  quadrennium  compendium  endometrium  planetarium