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/ˈgamə/ Noun, pl. gammas 1. The name of the third letter of the Greek alphabet (Γ, γ), preceded by beta (Β, β) and followed by delta, (Δ, δ). ( 2. Third letter in the greek alphabet, variable used for a number of things in physics, in plasma physics gamma is often used as the variable for growth rates of instabilities. ( (Mathematics) 1. The Gamma function, symbolized by Γ. ( 2. A constant approximately equal to 0.55721566, symbolized by γ. ( (Physics) 1. A unit of magnetic field equal to 1 nT. ( Word origin: From Greek gamma, from Phoenician gimel, literally “camel”; so called for a fancied resemblance of its shape to some part of a camel. Gamma rays (1903) originally were thought to be a third type of radiation, now known to be identical with very short X-rays....

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