/ Dictionary / Index M mitochondrion: Meaning and Definition of Find definitions for: mi•to•chon•dri•on Pronunciation: (mī"tu-kon'drē-un), [key] — pl. -dri•a an organelle in the cytoplasm of cells that functions in energy production. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mitochondrion (Thesaurus) Mitnagged mitogen Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language