no·men·cla·to·ri·al (n??m?n-kl?-tôr??-?l)adj. Of or relating to nomenclature.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.nomenclatorial (?n??m?nkl??t??r??l) or nomenclaturaladjrelating to nomenclatureCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014