third letter of the Greek alphabet, c.1400, from Greek gamma, from Phoenician gimel, literally "camel" (see 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.
gamma gam·ma (gām'ə)
Symbol γ The third letter of the Greek alphabet.
The third item in a series or system of classification.
The third position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.
A unit of magnetic field strength equal to one hundred thousandth (10-5) of an oersted.
A unit of mass equal to one millionth (10-6) of a gram.
Relating to or being the atom or radical group that is in the third position relative to the functional group of atoms in an organic molecule.
Relating to or characterizing a polypeptide chain that is one of five types of heavy chains that may be present in immunoglobins.