te·neb·ri·o·nid (t?-n?b?r?-?-n?d?, t?n??-br??-)n. See darkling beetle.[From New Latin Tenebri?nidae, family name, from Tenebri?, type genus, from Latin tenebri?, tenebri?n-, one who avoids light, from tenebrae, darkness.]te·neb?ri·o·nid? adj.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.tenebrionid (t??n?br??n?d) n (Animals) any beetle of the family TenebrionidaeCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014dark?ling bee`tle n. any brown or black beetle of the family Tenebrionidae, the larvae of which feed on decaying plant matter. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.