magma /ˈmæɡ.mə/ noun4 •A mixture of molten silicate rock, crystals, and gas within the earth, which may be erupted as lava or cool in place to form igneous intrusions. •A basic algebraic structure consisting of a set equipped with a single binary operation. •Any soft doughy mass. •The residuum after expressing the juice from fruits. formsmagmas · magmata