noun Petrology.
a fine-grained volcanic rock consisting mainly of welded shards of feldspar and quartz.
Also called welded tuff.

1932; < Latin ign(is) fire + imbr-, stem of imber rain, shower + -ite1

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World English Dictionary
ignimbrite (ˈɪɡnɪmˌbraɪt)
See tuft Also called: welded tuft 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
[C20: from Latin ign(is) fire + imbr(is), imber shower of rain + -ite1]

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American Heritage
Science Dictionary
ignimbrite   (ĭg'nĭm-brīt')  Pronunciation Key 
A volcanic rock formed by the consolidation of volcanic ash and other material ejected by an explosive volcanic eruption.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The welded tuffs clasts were probably derived from an ignimbrite-type ash flow.
These deposits probably represent hot co-ignimbrite lag deposits.
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