1) Molten → rock material that occurs below Earth's surface.
From L. magma "dregs of an ointment," from Gk. magma "an ointment," from root of massein "to knead, mold."
Mâgma, loanword from Fr.
otâqak-e mâgmâ (#)
Fr.: chambre magmatique
A large cavity within the Earth's → crust containing → magma. When a → vent is opened to the surface, magma is extruded onto the surface as → lava.