ETYMOLOGY
from synonym + –icon, after lexicon
EXAMPLE
“…these were interspersed with original definitions of some contiguous terms peculiar to ourselves. His neat and useful, though not wholly trustworthy, book attained a second edition in 1783. It will not be superseded by the subsequent but inferior attempt of Mrs. Piozzi. Blair has deposited in his Rhetoric, and Dawson in his Philologia anglica, some further contributions to an english synonymicon …”
From: English Synonyms Discriminated
Introduction
By William Taylor, 1813
Lexicophilia 