Definition - A list or dictionary of synonyms.

Etymology -
The word derives via Latin from the Greek synonymon, word having the same sense as another (from syn, same + onyma, name)

Oxford English Dictionary -
Its first citation in this sense is from 1813:
"Blair has deposited in his Rhetoric … some further contributions to an english synonymicon."
(W. Taylor Eng. Synonyms Introd. p. xiv,)

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