pi meson

noun

, Physics.

1. pion.

pi meson

noun

1. another name for pion

pi meson

1. See pion

Word History and Origins

Origin of pi meson¹

First recorded in 1945–50

Example Sentences

About one-thirtieth of the times that a pi meson hit a deuterium nucleus, out came the eta meson, which decays into three pions.

From Time Magazine Archive

The mass of the quick-vanishing pi meson has been measured accurately, as well as its "spin," which is something like rotation.

From Time Magazine Archive