Designating those Indo-European languages, including the Italic, Hellenic, Celtic and Germanic subfamilies, that merged the palatal velar stops with the plain velars k, g, gh and maintained a distinction between them and the labiovelars kw, gw, gwh.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.