neogrammarian

from The Century Dictionary.

• noun An adherent of a school of students of comparative Indo-European grammar (since about 1875), who insist especially upon the importance and strictness of the laws of phonetic change.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative form of Neogrammarian.