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The Collaborative International Dictionary of English v.0.48 (gcide)

Lexicon \Lex"i*con\ (l[e^]ks"[i^]*k[o^]n), n. [Gr. lexiko`n (sc.
bibli`on), neut. of lexiko`s of or belonging to words, fr.
le`xis a speaking, speech, a way of speaking, a single word
or phrase, fr. le`gein to say, to speak. See {Legend}.]
A vocabulary, or book containing an alphabetical arrangement
of the words in a language or of a considerable number of
them, with the definition of each; a dictionary; especially,
a dictionary of the Greek, Hebrew, or Latin language.
[1913 Webster]