di·mer (d??m?r)n. A chemical compound or molecule consisting of two identical simpler molecules.[di- + (poly)mer.]di·mer?ic (d?-m?r??k) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.dimer (?da?m?) n (Chemistry) chem a. a molecule composed of two identical simpler molecules (monomers)b. a compound consisting of dimers[C20: from di-1 + -mer]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014di?mer (?da? m?r) n. 1. a molecule composed of two identical, simpler molecules. 2. a polymer derived from two identical monomers. [1905?10] di?mer?ic (-?m?r ?k) adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.di·mer (d??m?r) Any of various chemical compounds made of two smaller, identical molecules (called monomers) that are linked together.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.