-ium

Meanings

1. Used to form the names of metal elements, after the style of early-named elements, as well as the isotopes of hydrogen.
2. 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.
3. Used to form the name of polyatomic cations. Common examples are quaternary ammonium compounds used as neuromuscular blocking agents, cholinergic agents, anticholinergic agents, antibacterials/antiseptics, or other agents.
4. Appended to common words to create scientific-sounding or humorous-sounding fictional substance names.

1. Used to form the name of an aggregation or mass of something, such as biological tissue
2. Forms the name of biological structures and parts.

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

Etymology

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