/ Dictionary / Index M methoxsalen: Meaning and Definition of Find definitions for: me•thox•sa•len Pronunciation: (me-thok'su-lun), [key] — n. Pharm. a potent compound, CHO, derived from the seeds of the plant Ammi majus: used in combination with certain ultraviolet radiation for the treatment of severe psoriasis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methoxide methoxy 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