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lambda

noun

  1. the eleventh letter of the Greek alphabet (Λ, λ)
  2. Particle Physics an uncharged hyperon with a mass of c. 1,115.68 MeV/c, which is c. 2,183 times the mass of an electron: it decays very rapidly, usually into a nucleon and a pion
    sometimes called lambda particle or lambda hyperon

See lambda in American Heritage Dictionary 4

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