Geology. produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma.
of, pertaining to, or characteristic of fire.

1655–65; < Latin igneus, equivalent to ign(is) fire + -eus -eous

nonigneous, adjective
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World English Dictionary
igneous (ˈɪɡnɪəs)
1.  sedimentary Compare metamorphic (of rocks) derived by solidification of magma or molten lava emplaced on or below the earth's surface
2.  of or relating to fire
[C17: from Latin igneus fiery, from ignis fire]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1664, from L. igneus "of fire, fiery," from ignis "fire," from PIE *egni- (cf. Skt. agnih "fire, sacrificial fire," O.C.S. ogni, Lith. ugnis "fire").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
igneous   (ĭg'nē-əs)  Pronunciation Key 
  1. Relating to rocks or minerals formed by the cooling and hardening of magma or molten lava. Basalt and granite are examples of igneous rocks.

  2. Relating to the processes, such as volcanism, by which such rocks and minerals form.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Metamorphic and igneous rocks here show extremely complex structure, which
  represents a geologic history told in many chapters.
Igneous rock, unlike sedimentary rock, comes from volcanic activity.
The site is strewn with large boulders of dense igneous rock.
Tags: detrital zircons, igneous rocks, plate tectonics.
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