Positron (noun)

An antimatter particle that is the antiparticle of the electron, having the same mass but opposite charge.

Origin:

Late 1920s: from positive + -on (as in electron).

Examples:

1. The discovery of the positron was a major breakthrough in the field of particle physics.
2. Positrons are produced naturally in certain types of radioactive decay.
3. The positron emission tomography (PET) scan is a medical imaging technique that uses positrons to create detailed images of the body.
4. When a positron and an electron meet, they annihilate each other and produce gamma rays.
5. Positrons have been used to study the properties of antimatter in particle accelerators.