The Collaborative International Dictionary of English v.0.48:

Linguacious \Lin*gua"cious\ (l[i^][ng]*gw[=a]"sh[u^]s), a. [L.
   linguax, -acis, loquacious, fr. lingua tongue.]
   Given to the use of the tongue; loquacious. [Obs.]
   [1913 Webster]