Hadron

Composite subatomic particle

In particle physics, a hadron is a composite subatomic particle made of two or more quarks that are held together by the strong nuclear force. Pronounced , the name is derived from Ancient Greek ἁδρός (hadrós) 'stout, thick'. They are analogous to molecules, which are held together by the electromagnetic force.

From Wikipedia, under CC BY-SA. More on occurri.