e/Lachmann's law

Information
has gloss	eng: Lachmann's law is a somewhat disputed phonological sound law for Latin named after German Indo-Europeanist Karl Lachmann who first formulated it sometime in the middle of the 19th century. According to it, vowels in Latin lengthen before Proto-Indo-European voiced stops which are followed by another (unvoiced) stop.
lexicalization	eng: Lachmann's law
instance of	c/Sound laws