[an-tee-noo-tree-noh, -nyoo-, an-tahy-]
noun, plural antineutrinos. Physics.
the antiparticle of a neutrino, distinguished from the neutrino by having clockwise rather than counterclockwise spin when observing in the direction of motion.

1930–35; anti- + neutrino Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antineutrino (ˌæntɪnjuːˈtriːnəʊ)
n , pl -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 10th Edition
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American Heritage
Science Dictionary
antineutrino   (ān'tē-n-trē'nō, ān'tī-)  Pronunciation Key 
The antiparticle that corresponds to the neutrino.
The American Heritage® Science Dictionary
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