Webster's English Dictionary

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lexicon

lex.i.con \'lek-s*-.ka:n, -si-k*n\ \-si-k*\ n or lex.i.ca or lexicons [LGk 
   lexikon, fr. neut. of lexikos of words, fr. Gk lexis wor] pl d, speech, fr. 
   legein to say - more at LEGEND : a book containing an alphabetical 
   arrangement of the words in a language  and their definitions : DICTIONARY