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definitions

subternatural

adjective
  1. rare falling below what is accepted as natural; less than natural

Word Origin for subternatural

C19: from Latin subter- below + natural
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