/ Dictionary / Index W W particle: Meaning and Definition of Find definitions for: W particle Pronunciation: [key] — Physics. Physics. either of two types of charged intermediate vector bosons, one having a positive charge and the other a negative charge. Symbols: W, W Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. WPA WPB Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language