noun Chemistry.
a molecule composed of three identical, simpler molecules.
a polymer derived from three identical monomers.
Compare oligomer.

1925–30; < Greek trimerḗs having three parts. See tri-, -mer

trimeric [trahy-mer-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trimer (ˈtraɪmə)
a polymer or a molecule of a polymer consisting of three identical monomers

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
trimer   (trī'mər)  Pronunciation Key 
Any of various chemical compounds made of three smaller identical or similar molecules (called monomers) that are linked together. Trimers are linked by hydrogen bonds, coordinate bonds, or covalent bonds. Raffinose is a trimer composed of the monomers glucose, fructose, and galactose.
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