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trachyte
4 dictionary results for: trachyte
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

tra⋅chyte

   [trey-kahyt, trak-ahyt]
–noun
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:
1815–25; < F < Gk trāchýtēs roughness, equiv. to trāchý(s) rough + -tēs n. suffix
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This
tra·chyte     (trā'kīt', trāk'īt')  Pronunciation Key 
n.   A light-colored igneous rock consisting essentially of alkali feldspar.

[French, from Greek trākhus, rough.]
tra·chyt'ic (trə-kĭt'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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The American Heritage Science Dictionary - Cite This Source - Share This
trachyte   (trā'kīt', trāk'īt')  Pronunciation Key 
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 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Trachyte

Tra"chyte\, n. [Gr. ? rough, rugged: cg. F. trachyte.] (Geol.) An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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