Eta Meson Definition

noun
An electrically neutral meson having a mass 1,071 times that of the electron and a mean lifetime of about 5 × 10−19 second.
American Heritage

(physics) Either of two mesons made of a mixture of up, down and strange quarks and their antiquarks.

Wiktionary

Other Word Forms of Eta Meson

Noun

Singular:
eta meson
Plural:
eta mesons

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eta meson