[ an-tee-noo-tree-noh, -nyoo-, an-tahy- ]
/ ˌæn ti nuˈtri noʊ, -nyu-, ˌæn taɪ- /

noun, plural an·ti·neu·tri·nos. Physics.

the antiparticle of a neutrino, distinguished from the neutrino by having clockwise rather than counterclockwise spin when observing in the direction of motion.

Origin of antineutrino

First recorded in 1930–35; anti- + neutrino Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for antineutrino

/ (ˌæntɪnjuːˈtriːnəʊ) /

noun plural -nos

the antiparticle of a neutrino; a particle having oppositely directed spin to a neutrino, that is, spin in the direction of its momentum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for antineutrino

[ ăn′tē-nōō-trēnō, ăn′tī- ]

The antiparticle that corresponds to the neutrino.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.