What is the meaning of -ium?

Used to form the names of metal elements, after the style of early-named elements, as well as the isotopes of hydrogen.

Used to form the temporary systematic element name of a metallic or nonmetallic element which is postulated to exist, or which has been newly synthesized and has not yet been assigned a permanent name.

Used to form the name of polyatomic cations.

Appended to common words to create scientific-sounding or humorous-sounding fictional substance names.

Used to form the name of an aggregation or mass of something, such as biological tissue

Forms the name of biological structures and parts.

Used to indicate the setting where a given activity is carried out

Suffix used to form abstract nouns, sometimes denoting offices and groups. May no longer be productive.

Suffix appended to form names of chemical elements.

inflection of -ius:

Used to form nouns (loanwords) of Greek or Latin origin; -ium

Used to form nouns denoting chemical compounds, especially elements; -ium

Used to form nouns denoting plant designations; -ium

Used to form nouns denoting geological designations; -ium

Source: wiktionary.org

See also