[ˈprəʊtɒn], (Noun)

Definitions:
- a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron


Phrases:

Origin:
early 20th century (in sense ‘each of four hypothetical elements regarded as forming the basis of all the other elements’): from Greek, neuter of prōtos ‘first’. The modern sense is first recorded in 1920