trachyte
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Related to trachyte: phonolite
tra·chyte
(trā′kīt′, trăk′īt′)n.
A light-colored igneous rock consisting essentially of alkali feldspar.
[French, from Greek trākhus, rough.]
tra·chyt′ic (trə-kĭt′ĭk) adj.
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.
trachyte
(ˈtreɪkaɪt; ˈtræ-)n
(Geological Science) a light-coloured fine-grained volcanic rock of rough texture consisting of feldspars with small amounts of pyroxene or amphibole
[C19: from French, from Greek trakhutēs, from trakhus rough]
trachytoid adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
tra•chyte
(ˈtreɪ kaɪt, ˈtræk aɪt)n.
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.
[1815–25; < French < Greek trāchýtēs roughness =trāchý(s) rough + -tēs n. suffix]
tra•chyt•ic (trəˈkɪt ɪk) trach•y•toid (ˈtræk ɪˌtɔɪd, ˈtreɪ kɪ-) adj.
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