Source : Webster's Revised Unabridged Dictionary (1913)

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.