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magma (medicine)


magma


1. Any crude mixture of mineral or organic matters in the state of a thin paste.

2. <medicine> 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. A salve or confection of thick consistency.

3. <geology> The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc. The glassy base of an eruptive rock.

4. <chemistry> The amorphous or homogenous matrix or ground mass, as distinguished from well-defined crystals; as, the magma of porphyry.

Origin: L, fr. Gr, fr. To squeeze, knead.

Source: Websters Dictionary