n. pl. lex·i·consor lex·i·ca (-kə)
1. A dictionary.
a. A stock of terms used in a particular profession, subject, or style; a vocabulary: the lexicon of surrealist art.
b. The vocabulary of an individual person: “A few of the women tittered, whether in response to the fluctuating octaves of my voice or the awkwardness of my lexicon” (Elisabeth Brink).
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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.