Definition

A positively charged subatomic particle that lives in atomic nuclei and determines what element you're dealing with, composed of two up quarks and one down quark for those keeping score at home. This fundamental particle is why hydrogen acts like hydrogen and not like, say, uranium. It's basically the atomic bouncer that decides which element club you're in based on head count.

Example Usage

The cyclotron accelerated protons to nearly light speed for the particle physics experiment.

Source: Physics terminology

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