Definition of igneous in English:


Syllabification: ig·ne·ous
Pronunciation: /ˈignēəs


  • 1(Of rock) having solidified from lava or magma.
    More example sentences
    • The occurrence of these felsic extrusive igneous rocks potentially provides key information on the complex interplay of magmatism and tectonics.
    • This heat gradually accumulates and eventually causes localized eruptions of basaltic magmas (molten igneous rock).
    • The prevalence of Late Jurassic subduction-related igneous rocks indicates that arc formation and accretion orogeny were the most important processes during the evolution of this part of the Internal Hellenides.
  • 1.1Relating to or involving volcanic processes: igneous activity
    More example sentences
    • The layering in these ultramafic rocks, and their position above mantle tectonites, is attributed to lower crustal igneous processes.
    • However, enormous emphasis has been placed on them for understanding igneous processes and the evolution of Earth.
    • On Macquarie Island there's very similar kind of geology, as I'm sure Rick has described; we have mantle rocks and evidence of punctuated deformation events in igneous activity.
  • 1.2 rare Of fire; fiery.
    More example sentences
    • It is an igneous or fiery aura, not indeed in the open act of combustion, but composed of the finest and most minute particles of a peculiar species of elementary fire.


mid 17th century: from Latin igneus (from ignis 'fire') + -ous.

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