Words That Rhyme With "Cesium" :

3 syllables:

Fijian, trivium

4 syllables:

Brundisium, collegium, Elysium, gymnasium, gynoecium, indusium, magnesium, symposium, trapezium

5 syllables:

florilegium, gynostegium, paramecium

7 syllables:

malacopterygian