The Collaborative International Dictionary of English v.0.48:

Magma \Mag"ma\, n. [L., fr. Gr. ?, fr. ? to squeeze, knead.]
   1. Any crude mixture of mineral or organic matters in the
      state of a thin paste. --Ure.
      [1913 Webster]

   2. (Med.)
      (a) A thick residuum obtained from certain substances
          after the fluid parts are expressed from them; the
          grounds which remain after treating a substance with
          any menstruum, as water or alcohol.
      (b) A salve or confection of thick consistency.
          --Dunglison.
          [1913 Webster]

   3. (Geol.)
      (a) The molten matter within the earth, the source of the
          material of lava flows, dikes of eruptive rocks, etc.
      (b) The glassy base of an eruptive rock.
          [1913 Webster]

   4. (Chem.) The amorphous or homogenous matrix or ground mass,
      as distinguished from well-defined crystals; as, the magma
      of porphyry.
      [1913 Webster] Magna Carta

WordNet (r) 3.0 (2006):

magma
    n 1: molten rock in the earth's crust

The Free On-line Dictionary of Computing (30 December 2018):

Magma

    A program used for heavy duty
   algebraic computation in many branches of mathematics.  Magma,
   developed by John Cannon and associates at the University of
   Sydney, succeeded Cayley.  It runs at several hundred sites.

   E-mail: .

   (http://maths.usyd.edu.au:8000/u/magma/).

   [W. Bosma, J. Cannon and C. Playoust, The Magma algebra system
   I: The user language, J. Symb. Comp., 24, 3/4, 1997, 235-265].

   (2000-12-21)