/ Dictionary / Index P pseudoscalar: Meaning and Definition of Find definitions for: pseu•do•sca•lar Pronunciation: (s"du-skā'lur), [key] — adj. Physics, Math. a scalar quantity that changes sign when the sense of the orientation of the coordinate system is changed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pseudorabies pseudoscience Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language