A theoretical particle proposed in some physics models; an electron-like particle existing alongside ordinary electrons in certain conditions.
From co- 'together' plus electron (from Greek elektron 'amber'), creating a physics term for particles proposed to exist in parallel with standard electrons.
Physics loves creating 'co-' particles—coelectrons join electrons, selectrons pair with standard leptons—showing how when theorists need mirror-image particles, they reach for that ancient co- prefix to signal 'this is the paired version.'
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