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trachyte

[trey-kahyt, trak-ahyt] /ˈtreɪ kaɪt, ˈtræk aɪt/
noun
1.
a fine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite.
Origin
1815-1825
1815-25; < French < Greek trāchýtēs roughness, equivalent to trāchý(s) rough + -tēs noun suffix
Related forms
trachytic
[truh-kit-ik] /trəˈkɪt ɪk/ (Show IPA),
trachytoid
[trak-i-toid, trey-ki-] /ˈtræk ɪˌtɔɪd, ˈtreɪ kɪ-/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trachytoid

trachyte

/ˈtreɪkaɪt; ˈtræ-/
noun
1.
a light-coloured fine-grained volcanic rock of rough texture consisting of feldspars with small amounts of pyroxene or amphibole
Derived Forms
trachytoid (ˈtrækɪˌtɔɪd; ˈtreɪ-) adjective
Word Origin
C19: from French, from Greek trakhutēs, from trakhus rough
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
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trachytoid in Science
trachyte
  (trā'kīt', trāk'īt')   
A light-colored, fine-grained igneous rock consisting primarily of alkali feldspar together with some mafic minerals, especially hornblende. Unlike most igneous rocks, trachyte has little or no quartz. Trachyte is the fine-grained equivalent of syenite.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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