/ Dictionary / Index Y Yukawa meson: Meaning and Definition of Find definitions for: Yuka'wa me"son Pronunciation: [key] — Physics. Physics. a hypothetical elementary particle with finite rest mass, whose exchange between nucleons would account for the strong short-range forces between nucleons: subsequently identified as the pion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Yukawa yukky Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language