Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or characteristic of fire.
  • adj. Geology Formed by solidification from a molten state. Used of rocks.
  • adj. Geology Of or relating to rock so formed; pyrogenic.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to, having the nature of fire; containing fire; resembling fire; as, an igneous appearance
  • adj. Resulting from, or produced by, the action of great heat; with rocks, it could also mean formed from lava/magma; as, granite and basalt are igneous rocks

from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to, having the nature of, fire; containing fire; resembling fire.
  • adj. Resulting from, or produced by, the action of fire.

from The Century Dictionary and Cyclopedia

  • Pertaining to, consisting of, having the nature of, or resembling fire: as. igneous particles; igneous appearances.
  • Produced through the agency of fire, or as the result of volcanic and eruptive forces: used in geology in contradistinction to aqueous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. like or suggestive of fire
  • adj. produced by the action of fire or intense heat
  • adj. produced under conditions involving intense heat

Etymologies

From Latin igneus, from ignis, fire.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin igneus, from ignis fire; allied to Sanskrit agni, Lithuanian ugnis, Old Slavic ogne (Wiktionary)

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