/ Dictionary / Index P plasmapause: Meaning and Definition of Find definitions for: plas•ma•pause Pronunciation: (plaz'mu-pôz"), [key] — n. Astron. the boundary of the plasmasphere, where the particle density decreases very rapidly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plasma membrane plasmapheresis Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language