ten·e·brif·ic (t?n??-br?f??k)adj.1. Serving to obscure or darken.2. Gloomy; dark.[Latin tenebrae, darkness + -fic.]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.tenebrific (?t?n??br?f?k) adjcausing darknessCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ten?e?brif?ic (?t?n ??br?f ?k) adj. producing darkness. [1640?50;