Definition of -ium in English:

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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


Modern Latin in sense 2, sense 3, and sense 4 via Latin from Greek -ion.

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Syllabification: -ium

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