A Positive Electron?
This page is the CodyCross answer for the clue below from Forests, Group 1996, Puzzle 4 (Subarctic Zone).
Question is: A Positive Electron?
and the answer is: POSITRON
Word Meaning:
POSITRON — (particle physics) The antimatter equivalent of an electron, having the same mass but a positive charge.
Definitions from Wiktionary.