Source : Webster's Revised Unabridged Dictionary (1913)

Linguistic \Lin*guis"tic\ (l[i^][ng]*gw[i^]s"t[i^]k),
Linguistical \Lin*guis"tic*al\ (-t[i^]*kal), a. [Cf. F.
   linguistique.]
   Of or pertaining to language; relating to linguistics, or to
   the affinities of languages.