-ium Syllabification: (-ium)Definition of -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:myceliumOrigin:modern Latin in -ium (sense 2), -ium (sense 3), and -ium (sense 4) via Latin from Greek -ion-ium in other Oxford dictionaries Definition of -ium in the British & World English dictionary
