1》 forming 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.
3》 denoting a region of the body: pericardium.
4》 denoting a biological structure: mycelium.
mod. L. in senses 2, 3, and 4, via L. from Gk -ion.

English new terms dictionary. 2014.

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