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1 definition found
 for pion
From The Collaborative International Dictionary of English v.0.48 :

  Meson \Mes"on\, n. [NL., fr. Gr. me`son middle, neut. of me`sos,
     a., middle.]
     1. (Anat.) The mesial plane dividing the body of an animal
        into similar right and left halves. The line in which it
        meets the dorsal surface has been called the dorsimeson,
        and the corresponding ventral edge the ventrimeson. --B.
        G. Wilder.
        [1913 Webster]
     2. (Physics) An elementary particle made up of two quarks; a
        hadron having a baryon number of zero; any hadron other
        than a baryon. Mesons are bosons with integral values of
        spin, having a mass intermediate between those of the
        electron and a nucleon; they may have positive or negative
        charges, or may be neutral. Mesons are of three types: the
        pion ([pi]-meson), kaon (K-mesons), and
     mu meson (Physics) the former name for the muon, a
        particle which is not a true meson[2]. The term is no
        longer used in technical literature, except historically.

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