any crude mixture of mineral or organic matters in the state of a thin paste.-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.-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.-the amorphous or homogenous matrix or ground mass, as distinguished from well-defined crystals; as, the magma of porphyry.