/ Dictionary / Index M morphactin: Meaning and Definition of Find definitions for: mor•phac•tin Pronunciation: (môr-fak'tin), [key] — n. Biochem. any of various synthetic compounds, derived from fluorine and carboxylic acid, that regulate the growth and development of plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. morph morphallaxis Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language