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gam·ma (găḿə)

[Middle English, from Greek, of Phoenician origin.]

noun 

  1. The third letter of the Greek alphabet.
  2. The third item in a series or system of classification.
  3. A unit of magnetic intensity equal to one hundred thousandth (10-5) of an oersted.
  4. A unit of mass equal to one millionth (10-6) of a gram.
  5. Chemistry The third position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.