모든 원자핵의 구성 요소로서 양의 전하를 가진 안정된 아원자 입자.
A stable subatomic particle with a positive electric charge, found in the nucleus of every atom.
예문:
"The number of protons in the nucleus determines the atomic number of an element."
"A hydrogen ion is essentially a bare proton."
"Protons and neutrons are held together in the nucleus by the strong nuclear force."