/ Dictionary / Index C codon: Meaning and Definition of Find definitions for: co•don Pronunciation: (kō'don), [key] — n. Genetics. a triplet of adjacent nucleotides in the messenger RNA chain that codes for a specific amino acid in the synthesis of a protein molecule. Also calledCf. anticodon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: codon (Thesaurus) codominant codpiece Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language