1) Linguistics 
study of language; study of the tongue
• (n.) The definition and explanation of terms; a glossary. • (n.) The science of language; comparative philology; linguistics; glottology.
(glos-ol´ә-je) the sum of knowledge regarding the tongue.
Glos·sol'o·gy noun [ Greek ... tongue + -logy : confer French glossologie . See 3d Gloss .] 1. The definition and explanation of terms; a glossary. 2. The science of language; comparative philology; linguistics; glottology. 
Type: Term Pronunciation: glos-ol′ŏ-jē Definitions: 1. The branch of medical science concerned with the tongue and its diseases. Synonyms: glottology
glossology 1. In medicine, the study of the tongue and its diseases. 2. The definitions and explanations of terms; as seen in a glossary. 3. The science of language; comparative philology; linguistics.
linguistics.