noun:any of a group of fundamental particles (as the pion and kaon) made up of a quark and an antiquark that are subject to the strong force and have zero or an integer number of quantum units of spin
Movie clips
Movie quotes
(..) PMS. All night long, y'all! Okay, well, let's jump right in. First question for ten points: "What is the iso-spin singlet partner "of the pi-zero meson?" PMS? - The eta meson. - Correct. - Formal protest. - On what grounds? (..)
