1. The antimatter counterpart of an electron; a positively charged particle with the same mass as an electron.
Usage: physics; Also called a positron.

Examples

• When an antielectron collides with an electron, both particles annihilate and release energy.
• The antielectron has a positive charge equal in magnitude to the electron's negative charge.
• Scientists use antielectrons in positron emission tomography (PET) scans for medical imaging.
• The discovery of the antielectron provided evidence for the existence of antimatter.
• In particle physics, the antielectron is the simplest example of an antimatter particle.