Verner's Law Definition

vûrnərz, vĕr-

noun

An explanation for a series of apparent exceptions to Grimm's law, stating that the Proto-Germanic word-medial voiceless spirants (f, , h, s), derived from the Proto-Indo-European voiceless stops (p, t, k) and voiceless spirant (s), regularly became voiced (v, , g, z), respectively, and final (s) became (z), when the vowel immediately preceding these did not in Proto-Indo-European bear the principal accent of the word.

Webster's New World

Origin of Verner's Law

After Karl Adolph Verner (1846–1896), Danish philologist

From American Heritage Dictionary of the English Language, 5th Edition
Named after Danish linguist Karl Verner (1846-1896).

From Wiktionary