basalt [ b uh- sawlt, bas-awlt, bey-sawlt ] SHOW IPA / bəˈsɔlt, ˈbæs ɔlt, ˈbeɪ sɔlt / PHONETIC RESPELLING noun the dark, dense igneous rock of a lava flow or minor intrusion, composed essentially of labradorite and pyroxene and often displaying a columnar structure. QUIZZES QUIZ YOURSELF ON AFFECT VS. EFFECT!
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Origin of basalt
a misreading, in manuscripts of Pliny, of
) touchstone, equivalent to
) touchstone (ultimately <Egyptian
) graywacke) +
-ītēs -ite 1 OTHER WORDS FROM basalt ba·sal·tic, ba·sal·tine [b uh- sawl-tin, -tahyn], /bəˈsɔl tɪn, -taɪn/, adjective sub·ba·sal·tic, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for basalt
In the valleys which we passed through, there was a large quantity of
basaltic rock and most beautifully crystallized quartz.
The first flow reached a thickness here of fully three hundred feet, and exhibits a fine development of
Contraction parting or jointing is often observed, being especially characteristic of the
basaltic lava east of Cowlitz Glacier shows the latter structure in a striking manner. noun a fine-grained dark basic igneous rock consisting of plagioclase feldspar, a pyroxene, and olivine: the most common volcanic rock and usually extrusive See flood basalt a form of black unglazed pottery resembling basalt Derived forms of basalt basaltic, adjective Word Origin for basalt
C18: from Late Latin
basaltēs, variant of basanītēs, from Greek basanitēs touchstone, from basanos, of Egyptian origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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A dark, fine-grained, igneous rock consisting mostly of plagioclase feldspar and pyroxene, and sometimes olivine. Basalt makes up most of the ocean floor and is the most common type of lava. It sometimes cools into characteristic hexagonal columns, as in the Giant's Causeway in Anterim, Northern Island. It is the fine-grained equivalent of gabbro.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
basalt [ (buh- sawlt, bay-sawlt) ]
A hard, dense
igneous rock that makes up much of the material in tectonic plates. The part of the Earth's crust beneath the oceans consists mainly of basalt whereas continental crust consists mainly of less dense rocks, such as granite. ( See plate tectonics.)
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.