What is "neogrammarian"

Neogrammarian \Ne`o*gram*ma"ri*an\, n. [Neo- + grammarian; a translation of G. junggrammatiker.] One of a group of philologists who apply phonetic laws more widely and strictly than was formerly done, and who maintain that these laws admit of no real exceptions. -- Ne`o*gram*mat"ic*al, a.

n. (alternative form of Neogrammarian English)

The Neogrammarians (also Young Grammarians; German: Junggrammatiker) were a German school of linguists, originally at the University of Leipzig, in the late 19th century who proposed the Neogrammarian hypothesis of the regularity of sound change.