|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,)