lex·i·con 
(lĕksĭ-kŏn′)
(lĕksĭ-kŏn′)n. pl. lex·i·cons or lex·i·ca (-kə)
1. A dictionary.
2. A stock of terms used in a particular profession, subject, or style; a vocabulary: the lexicon of surrealist art.
3. Linguistics The morphemes of a language considered as a group.
[Medieval Latin, from Greek lexikon (biblion), word(book), from neuter of lexikos, of words, from lexis, word, from legein, to speak; see leg- in the Appendix of Indo-European roots.]