Definition of -ium in US English:



  • 1Forming nouns adopted unchanged from Latin (such as alluvium) or based on Latin or Greek words (such as euphonium).

  • 2Forming names of metallic elements.

  • 3Denoting a region of the body.

  • 4Denoting a biological structure.



Modern Latin in -ium (sense 2, -ium sense 3, -ium sense 4), via Latin from Greek -ion.