[ig-nee-uh s] /ˈɪg ni əs/

Geology. produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma.
of, relating to, or characteristic of fire.
(of rocks) derived by solidification of magma or molten lava emplaced on or below the earth’s surface Compare sedimentary, metamorphic (sense 2)
of or relating to fire

1660s, from Latin igneus “of fire, fiery,” from ignis “fire,” from PIE *egni- “fire” (cf. Sanskrit agnih “fire, sacrificial fire,” Old Church Slavonic ogni, Lithuanian ugnis “fire”).


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  • Igneous intrusive rock

    noun See intrusive rock

  • Igneous rock

    igneous rock [(ig-nee-uhs)] Rocks formed by the cooling and solidifying of molten materials. Igneous rocks can form beneath the Earth’s surface, or at its surface, as lava. Note: Granite, solid volcanic lava, and basalt are examples of igneous rock.

  • Ignescent

    [ig-nes-uh nt] /ɪgˈnɛs ənt/ adjective 1. emitting sparks of fire, as certain stones when struck with steel. 2. bursting into flame. noun 3. an ignescent substance. /ɪɡˈnɛsənt/ adjective 1. giving off sparks when struck, as a flint 2. capable of bursting into flame noun 3. an ignescent substance

  • Ignipuncture

    ignipuncture ig·ni·punc·ture (ĭg’nə-pŭngk’chər) n. Surgical closing of a break in the retina due to retinal separation by cauterizing the site of the break with a hot needle.

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