One of the mysteries of the English language finally explained.
Each of a number of tautomeric molecules which differ from each other only in the position of a proton; a prototropic tautomer.
Each of the protein subunits of which an oligomeric protein is built up.
1920s; earliest use found in Thomas Lowry (1874–1936), physical chemist. From proto- + -mer<br>1960s. From prot- + -o- + -mer.
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