/ Dictionary / Index M mas. pil.: Meaning and Definition of Find definitions for: mas. pil. Pronunciation: [key] (in prescriptions) a pill mass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Maspero Masqat Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language