Tetramer

A tetramer (/ˈtɛtrəmər/) (tetra-, "four" + -mer, "parts") is an oligomer formed from four monomers or subunits.

An example from inorganic chemistry is titanium methoxide with the empirical formula Ti(OCH3)4, which is tetrameric in solid state and has the molecular formula Ti4(OCH3)16.

[1] An example from organic chemistry is kobophenol A, a substance that is formed by combining four molecules of resveratrol.

[2][3] In biochemistry, it similarly refers to a biomolecule formed of four units, that are the same (homotetramer), i.e. as in Concanavalin A or different (heterotetramer), i.e. as in hemoglobin.

The different sub-units may have each their own activity, such as binding biotin in avidin tetramers, or have a common biological property, such as the allosteric binding of oxygen in hemoglobin.