Pronunciation: (poz'i-tron"), [key]
n. Physics.
an elementary particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge; the antiparticle of the electron. Also called antielectron, positive electron.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

positivitypositron emission tomography
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