The Collaborative International Dictionary of English v.0.48:

Glossology \Glos*sol"o*gy\, n. [Gr. ? tongue + -logy: cf. F.
   glossologie. See 3d Gloss.]
   1. The definition and explanation of terms; a glossary.
      [1913 Webster]

   2. The science of language; comparative philology;
      linguistics; glottology.
      [1913 Webster]