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M_______
Definitions
An older name for a meson.
Word origin
From meso- + -tron. Coined by American physicists Carl Anderson and Seth Neddermeyer in 1938 in a letter to Nature titled "Mesotron (Intermediate Particle) as a Name for the New Particles of Intermediate Mass".
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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