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.
- non·ig·ne·ous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use igneous in a sentence
The samples were of crystalline igneous rock, meaning rock that solidified into crystals from hot lava or magma.First Martian rock samples from Perseverance edge closer to settling water question | Leto Sapunar | September 17, 2021 | Popular-Science
Perseverance has also found evidence of igneous, or volcanic, rocks on Jezero’s crater floor.See some of the most intriguing photos from NASA’s Perseverance rover so far | Lisa Grossman | August 19, 2021 | Science News
Formed by eons of erosion between two different kinds of igneous rock, the cave sits right in the middle of where weather from the Pacific Ocean meets weather from the Atlantic Ocean.What’s in a packrat’s petrified pee? Just a few thousand years of secrets. | Rachel Feltman | August 12, 2021 | Popular-Science
Unlike magma turning into igneous rock, for example, diamonds don’t melt and recrystallize.Diamonds contain remnants of Earth’s ancient atmosphere | Monroe Hammond | July 20, 2021 | Popular-Science
They needed more data from various igneous rocks to expand their calibration of the instrument.These scientists spent decades pushing NASA to go back to Venus. Now they’re on a hot streak. | Corinne Iozzio | June 29, 2021 | Popular-Science
The most ancient and lowest stratum of this igneous formation is a compact conglomerate known as tufa lithoide.The Catacombs of Rome | William Henry Withrow
The "erratics" comprised a great variety of metamorphic and igneous rocks, and, on a more limited scale, sedimentary types.The Home of the Blizzard | Douglas Mawson
The beacons were found to be part of a horizontal, stratified series of sandstones underlying the igneous rock.The Home of the Blizzard | Douglas Mawson
The metamorphism of the igneous rocks is regional in nature and has the same increase from west to east as the sediments.
The stone formation bears the usual indications of aqueous and igneous deposits, but more of the former than the latter.Official Report of the Niger Valley Exploring Party | Martin Robinson Delany
British Dictionary definitions for igneous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for igneous
Relating to rocks or minerals formed by the cooling and hardening of magma or molten lava. Basalt and granite are examples of igneous rocks.
Relating to the processes, such as volcanism, by which such rocks and minerals form.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.