ˈignēəs adjective
Etymology: Latin igneus, from ignis fire; akin to Sanskrit agni fire, Lithuanian ugnìs, Old Slavic ognĭ
1. : of, relating to, resembling, or suggestive of fire : containing fire : fiery
an igneous desert atmosphere
2. : relating to, resulting from, or suggestive of the intrusion or extrusion of magma or the activity of volcanoes