(geology) The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc.

plural of magma

Fluid rock material of basaltic origin

(geology) A large underground pool of molten rock lying under the surface of the earth's crust.

plural of magma chamber

plural of basaltic magma

Pertaining to magma or magmatism.

A rock formed from magma

(geology) The flow of magma / (geology) The formation of igneous rock by the solidification of magma

(geology) In respect of, or due to, magma