[ 'magmə ]
■ noun ( plural ~s or ~ta -mətə ) hot fluid or semi-fluid material within the earth's crust from which lava and other igneous rock is formed by cooling.
Derivatives
~tic adjective
Origin
ME (in the sense 'residue left after evaporation or pressing of a semi-liquid substance'): via L. from Gk ~ (from massein 'knead').