igneous rock
Cultural Dictionary
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.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Igneous rock is always a great word to know.
So is callithumpian. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
WordNet
igneous rock

noun
rock formed by the solidification of molten magma 
WordNet® 3.0, © 2006 by Princeton University.
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