Definition of "igneous"

igneous

/ˈɪɡ.ni.əs/

adjective
not comparable
1. Pertaining to or having the nature of fire; containing fire; resembling fire.
2. (geology) Resulting from, or produced by, great heat. With rocks, it could also mean formed from lava or magma.
  Quotations
  All formations, whether igneous or aqueous, which can be shown by any such proofs to be of a date posterior to the introduction of man, will be called Recent.
  1835, Charles Lyell, chapter V, in Principles of Geology […] , 4th edition, volume III, London: John Murray, Book IV, page 385