No·a·chi·an (n?-??k?-?n) also No·ach·ic (-?k??k) or No·ach·i·cal (-?-k?l)adj.1. Bible Of or relating to Noah or his time.2. Antiquated; ancient; long obsolete.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Noachian (n???e?k??n) or Noachicadj (Bible) Old Testament of or relating to the patriarch NoahCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014No?a?chi?an (no??e? ki ?n) , adj. of or pertaining to the patriarch Noah or his time. [1670?80; Noach (variant of Noah) + -ian]Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.