rhyolite

[rahy-uh-lahyt]

Origin of rhyolite

1865–70; rhyo- (irregular < Greek rhýax stream of lava) + -lite
Related formsrhy·o·lit·ic [rahy-uh-lit-ik] /ˌraɪ əˈlɪt ɪk/, adjective
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British Dictionary definitions for rhyolite

rhyolite

noun
  1. a fine-grained igneous rock consisting of quartz, feldspars, and mica or amphibole. It is the volcanic equivalent of granite
Derived Formsrhyolitic (ˌraɪəˈlɪtɪk), adjective

Word Origin for rhyolite

C19: rhyo- from Greek rhuax a stream of lava + lite
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

rhyolite in Science

rhyolite

[rīə-līt′]
  1. A usually light-colored, fine-grained extrusive igneous rock that is compositionally similar to granite. It often includes flow lines formed during the extrusion.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.