Definition of pion
: a meson that is a combination of up and down quarks and antiquarks, that may be positive, negative, or neutral, and that has a mass about 270 times that of the electron
- Trending Now: More Trending:
- hogwash probity sequacious inadmissible oligarch, pejorative
- ALL
What's Trending Now
More Trending Words
Recent Examples of pion from the Web
-
The Xi decays into a particle called the lambda baryon and three lighter particles, the K- (or kaon) and two pions.
-
The most famous of these two-quark particles are kaons and pions.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of pion
contraction of pi-meson
Learn More about pion
Seen and Heard
What made you want to look up pion? Please tell us where you read or heard it (including the quote, if possible).
