An example of a
. The protein's
subunits are coloured red and blue.
tetramer ( ) ( , "four" + tetra- , "parts") is an -mer oligomer formed from four monomers or subunits. The associated propriety is called tetramery. An example from inorganic chemistry is titanium methoxide with the empirical formula Ti(OCH 3) 4, which is tetrameric in the solid state and has the molecular formula Ti 4(OCH 3) 16. An example from  organic chemistry is kobophenol A, a substance that is formed by combining four molecules of resveratrol. 
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. Hemoglobin has 4 similar sub-units while immunoglobulins have 2 very different sub-units. 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.
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Look up in Wiktionary, the free dictionary. Tetramer