/ Dictionary / Index A antineutrino: Meaning and Definition of Find definitions for: an•ti•neu•tri•no Pronunciation: (an"tē-n-trē'nō, -ny-, an"tī-), [key] — pl. -nos. the antiparticle of a neutrino, distinguished from the neutrino by having clockwise rather than counterclockwise spin when observing in the direction of motion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antineutrino (Thesaurus) antineoplastic antineutron Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language