lex·i·con /ˈlɛksɪˌkɒn, -kən/ Pronunciation Key - Show Spelled Pronunciation[lek-si-kon, -kuhn] Pronunciation Key - Show IPA Pronunciation
–noun, plural lex·i·ca /ˈlɛksɪkə/ Pronunciation Key - Show Spelled Pronunciation[lek-si-kuh] Pronunciation Key - Show IPA Pronunciation, lex·i·cons.
1. a wordbook or dictionary, esp. of Greek, Latin, or Hebrew.
2. the vocabulary of a particular language, field, social class, person, etc.
3. inventory or record: unparalleled in the lexicon of human relations.
4. Linguistics.
a. the total inventory of morphemes in a given language.
b. the inventory of base morphemes plus their combinations with derivational morphemes.
Nothing is special about calling a book Lexicon.