positron

n (physics 物) minute piece of matter (elementary particle) that has a positive electric charge and the same mass as an electron 正电子; 阳电子. Cf 参看 electron.

portraiture, portray, portrayal, Portsmouth, Portugal, Portuguese, pose, poser, poseur, posh, posit, position, positional, positive, positive pole, positively, positiveness, positivism, positivist, positivistic, posse, possess, possession, possessions, possessive, possessively, possessiveness, possessor, posset, possibility, possible, possibly, possum, post, post office, post-, post-bag, post-box (US `mailbox), post-date, post-free,