ignimbrite(redirected from welded tuft)
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A volcanic rock formed by the deposition and consolidation of ash flows and nuées ardentes.
[Latin ignis, fire + imber, imbr-, rain + -ite.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) a rock formed by the deposition at high temperature and the consolidation of a nuée ardente or other type of ash flow, being a complicated mixture of volcanic materials welded together by heat, hot gases, and pressure. Also called: welded tuft See tuft
[C20: from Latin ign(is) fire + imbr(is), imber shower of rain + -ite1]
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