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Related to Verner's law: Grimm's law
Ver·ner's Law(vûr′nərz, vĕr′-)
A law stating essentially that Proto-Germanic noninitial voiceless fricatives in voiced environments became voiced when the previous syllable was unstressed in Proto-Indo-European. For example, both the th- and the -d of English third are descended from Proto-Germanic voiceless *th, but the second was voiced by Verner's Law.
[After Karl Adolph Verner (1846-1896), Danish philologist.]
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.
(Linguistics) linguistics a modification of Grimm's Law accommodating some of its exceptions. It states that noninitial voiceless fricatives in Proto-Germanic occurring as a result of Grimm's law became voiced fricatives if the previous syllable had been unstressed in Proto-Indo-European
[C19: named after Karl Adolph Verner (1846–96), Danish philologist, who formulated it]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a statement of the regularity behind some apparent exceptions in the Germanic languages to Grimm's law, namely, that Proto-Germanic voiceless fricatives became voiced when occurring between voiced sounds if the immediately preceding vowel was not accented in Proto-Indo-European: formulated 1875 by Karl Verner.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.