-ium /-i-əm/

1. Forming nouns denoting: a metallic element, as in plutonium
2. A group forming a positive ion, as in ammonium
3. A biological structure, as in conidium

• arcanists
• arcanum
• arccos
• arc de triomphe
• arced
• arc-en-ciel
• -arch
• arch
• arch-
• arch.
• archae-
• Archaea
• Archaean
• Archaebacteria
• Archaei
• archaeo-
• archaeoastronomy
• archaeol.
• archaeological
• archaeologically
• archaeologies
• archaeologist
• archaeologists
• archaeology
• archaeomagnetism