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crustal

[kruhs-tl] /ˈkrʌs tl/
adjective
1.
of or relating to a crust, as of the earth.
Origin of crustal
1855-1860
1855-60; < Latin crūst(a) shell, crust + -al1
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Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for crustal

crustal

/ˈkrʌstəl/
adjective
1.
of or relating to the earth's crust
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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