/ Dictionary / Index A auxotroph: Meaning and Definition of Find definitions for: aux•o•troph Pronunciation: (ôk'su-trof", -trōf"), [key] — n. Biol. a mutant organism, esp. a microorganism, that has a nutritional requirement not shared by the parent organism. Cf. prototroph (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. auxochrome Av Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language