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plutonic

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plu⋅ton⋅ic

  [ploo-ton-ik]
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–adjective Geology.
noting or pertaining to a class of igneous rocks that have solidified far below the earth's surface.
Origin:
1790–1800; < L Plūtōn- (s. of Plūtō Pluto < Gk Ploútōn) + -ic; orig. referring to the Plutonic theory (see plutonism )
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Plu⋅to⋅ni⋅an

  [ploo-toh-nee-uhn]
–adjective
Also, Plu⋅ton⋅ic  [ploo-ton-ik] . of, pertaining to, or resembling Pluto or the lower world; infernal.
Origin:
1660–70; < L Plūtōni(us) (< Gk Ploutnios, deriv. of Ploútōn Pluto ) + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Plu·to·ni·an   (plōō-tō'nē-ən)   
adj.  

  1. Of or relating to the god Pluto or the underworld; infernal.

  2. Of or relating to the dwarf planet Pluto.

plu·ton·ic   (plōō-tŏn'ĭk)   
adj.  Of deep igneous or magmatic origin: plutonic rocks.

[From Latin Plūtō, Plūtōn-, Pluto; see Pluto.]
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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