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Definition of Lava
1. Noun. Rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface.
Definition of Lava
1. n. The melted rock ejected by a volcano from its top or fissured sides. It flows out in streams sometimes miles in length. It also issues from fissures in the earth's surface, and forms beds covering many square miles, as in the Northwestern United States.
Definition of Lava
1. molten rock that issues from a volcano [n -S]