Webster's English Dictionary

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tectonic

tec.ton.ic \tek-'ta:n-ik\ aj [LL tectonicus, fr. Gk tektonikos of a 
   builder, fr. tekto-nX builder - more at TECHNICAL : STRUCTURAL, 
   CONSTRUCTIONAL : as  : ARCHITECTURAL  : of or relating to the deformation 
   of the earth's crust, the forces inv olved in or producing such 
   deformation, and the resulting forms