/ Dictionary / Index D dimer: Meaning and Definition of Find definitions for: di•mer Pronunciation: (dī'mur), [key] — n. Chem. a molecule composed of two identical, simpler molecules. a polymer derived from two identical monomers. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dimer (Thesaurus) dimension stone dimercaprol Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language