Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Relating to or characteristic of fire.
  • adjective Formed by solidification from a molten state. Used of rocks.
  • adjective Relating to rock so formed; pyrogenic.

from The Century Dictionary.

  • 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 the GNU version of the Collaborative International Dictionary of English.

  • adjective Pertaining to, having the nature of, fire; containing fire; resembling fire.
  • adjective (Geol.) Resulting from, or produced by, the action of fire.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Pertaining to, having the nature of fire; containing fire; resembling fire; as, an igneous appearance
  • adjective geology 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

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

[From Latin igneus, from ignis, fire.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin igneus, from ignis fire; allied to Sanskrit agni, Lithuanian ugnis, Old Slavic ogne

Examples

  • They are called "igneous" rocks, from the Latin word

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  • No, not as in igneous, granite, marble or quartz, but as in I just spent 5 days in Guadalajara and had a rockin 'good time.

    Guadalajara Rocks!

  • No, not as in igneous, granite, marble or quartz, but as in I just spent 5 days in Guadalajara and had a rockin 'good time.

    Guadalajara Rocks!

  • No, not as in igneous, granite, marble or quartz, but as in I just spent 5 days in Guadalajara and had a rockin 'good time.

    Guadalajara Rocks!

  • When we pass from the agency which geologists term igneous, to aqueous and atmospheric agencies, we see the like ever growing complications of effects.

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  • Like all the radioactive clocks used by geologists, potassium/ argon timing works only with so-called igneous rocks.

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  • Like all the radioactive clocks used by geologists, potassium/ argon timing works only with so-called igneous rocks.

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  • An attentive examination of a metamorphic region shows that here and there the alteration and recrystallisation have proceeded so far that the rocks graduate into granites and other so-called igneous rocks.

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  • • Rocks are classified as igneous, sedimentary, or metamorphic, according to how they formed.

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  • The lone science class I'd been required to take, an introductory geology course, was graded pass/fail, and though I'd passed it (barely), I still wasn't sure what "igneous" meant.

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