Igneous a. : Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance.

Igneous a. : Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.

Example:
How is Igneous rock used in everyday life?

Taxonomy
rocks, igneous rocks, magma, composition, melt, minerals, volcanic rocks, mantle, felsic, crystals, intrusive igneous rocks, carbon dioxide, Felsic magma, quartz, plutonic rocks, peridotite, pressure, Extrusive igneous rocks.

Defination from the web:
Igneous rock (from the Latin ignis meaning fire) is one of the three main rock types (the others being sedimentary and metamorphic rock) ... Over 700 types of igneous rocks have been described, most of them formed beneath the surface of Earth's crust. ...