1
a
: formed by solidification of magma
igneous rock
b
: relating to, resulting from, or suggestive of the intrusion or extrusion of magma or volcanic activity
2
: of, relating to, or resembling fire : fiery
Examples of igneous in a Sentence
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Whitehouse argues that these crystals formed in an igneous rock 2.8 billion years ago and then were eroded, washed into the sea, and settled in the silt.
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Howard Lee, ArsTechnica, 11 Aug. 2025
Grand Canyon Formed millions of years ago through the uplift of igneous and metamorphic rock and carved by the Colorado River through erosion, the Grand Canyon is one of America's greatest geological treasures.
—Michael Salerno, AZCentral.com, 22 July 2025
With a mix of volcanic soils and igneous and metamorphic rock and less average rainfall than other areas in Napa Valley, vines here are forced to dig deep for water, which supports vine longevity during periods of drought or low rainfall.
—Mike Desimone, Robb Report, 20 July 2025
Most beautiful places in Arizona Grand Canyon Formed millions of years ago through the uplift of igneous and metamorphic rock and carved by the Colorado River through erosion, the Grand Canyon is one of America's greatest geological treasures.
—Michael Salerno, AZCentral.com, 15 July 2025
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Howard Lee, ArsTechnica, 11 Aug. 2025
Grand Canyon Formed millions of years ago through the uplift of igneous and metamorphic rock and carved by the Colorado River through erosion, the Grand Canyon is one of America's greatest geological treasures.
—Michael Salerno, AZCentral.com, 22 July 2025
With a mix of volcanic soils and igneous and metamorphic rock and less average rainfall than other areas in Napa Valley, vines here are forced to dig deep for water, which supports vine longevity during periods of drought or low rainfall.
—Mike Desimone, Robb Report, 20 July 2025
Most beautiful places in Arizona Grand Canyon Formed millions of years ago through the uplift of igneous and metamorphic rock and carved by the Colorado River through erosion, the Grand Canyon is one of America's greatest geological treasures.
—Michael Salerno, AZCentral.com, 15 July 2025
See All Example Sentences for igneous
Cite this Entry
“Igneous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/igneous. Accessed 21 Aug. 2025.
Copy CitationKids Definition
igneous
adjective
ig·ne·ous
ˈig-nē-əs 
: formed by hardening of melted earth
igneous rock
compare metamorphic, sedimentary sense 2
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