Definition of -ium in English:

-ium

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

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

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody