Igneous
Igneous , adjective
[Latin igneus, from ignis fire; allied to Sanskrit agni, Lithuanian ugnis, OSlav. ogne.]
1.
Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance.
2.
(Geology) Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.