/ Dictionary / Index M mastax: Meaning and Definition of Find definitions for: mas•tax Pronunciation: (mas'taks), [key] — n. the muscular pharynx of a rotifer, containing a chewing apparatus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mastaba mast ball Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language