pi·on 
(pīŏn′)
(pīŏn′)n.
Any of the three least massive mesons, having a positive, neutral, or negative electric charge. The charged pions have a mass 273 times that of an electron and a mean lifetime of 2.6 × 10-8 second, and the neutral pion has a mass 264 times that of an electron and a mean lifetime of 8.4 × 10-17 second. Also called pi meson.
[Contraction of PI MESON.]
- cartelization
- cartelize
- carter
- Carter
- Carter
- Carter
- Carter
- Cartesian
- Cartesian coordinate
- Cartesian coordinate system
- Cartesianism
- Cartesian plane
- Cartesian product
- Carthage
- Carthaginian
- carthorse
- Carthusian
- Cartier
- Cartier
- Cartier-Bresson
- cartilage
- cartilage bone
- cartilaginous
- cartilaginous fish
- cartload