suffix
1Forming nouns adopted unchanged from Latin (such as alluvium) or based on Latin or Greek words (such as euphonium).
2
(also -um)Forming names of metallic elements.‘cadmium’- ‘magnesium’
3Denoting a region of the body.
- ‘pericardium’
4Denoting a biological structure.
- ‘mycelium’
Origin
Are You Learning English? Here Are Our Top English Tips