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Word: meson (lookup in dictionary) (lookup stats)
Dates: during 1940-1940
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Usage:

...misnomer, since it was not an electron), the "barytron" (also a misnomer, because it means "heavy particle," whereas the particle is lighter than a proton). A name meaning "intermediate particle" was clearly in order, and so practically all U. S. physicists now call it the "mesotron" or "meson...

Author: /time Magazine | Title: Science: Powerful Brain | 1/29/1940 | See Source »

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