antineutrino

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

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

noun plural -nos

1. the antiparticle of a neutrino; a particle having oppositely directed spin to a neutrino, that is, spin in the direction of its momentum

1. The antiparticle that corresponds to the neutrino.