Definitions for: Magma

[n] molten rock in the earth's crust

Webster (1913) Definition: 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.

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.

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.

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

See Also: rock, stone

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