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gneissoid

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gneiss⋅oid

[nahy-soid]
–adjective
resembling gneiss.

Origin:
1840–50; gneiss + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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gneiss   (nīs)   
n.  A banded or foliated metamorphic rock, usually of the same composition as granite.

[German Gneis, probably alteration of Middle High German ganeist, spark (from its appearance), from Old High German gneista.]
gneiss'ic (nī'sĭk), gneiss'oid' (nī'soid'), gneiss'ose' (nī'sōs') adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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