-ium

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[edit] English

From Latin -um (“neuter singular morphological suffix”), based on Latin terms for metals, such as ferrum.

-ium

Used to form the names of metal elements, after the style of early-named elements like

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-ium n, genitive -ii

Suffix used to form nouns, sometimes having the sense of bigger or more complicated.

auditor - auditorium

castellum (castle) - castilium (fortified city)
(New Latin) Suffix appended to form names of chemical elements.