1. Having the character of a synonym: synonymous words; synonymous species.
2. Equivalent in connotation: "a widespread impression that ... Hollywood was synonymous with immorality" (Doris Kearns Goodwin).
[From Medieval Latin synōnymus, from Greek sunōnumos : sun-, syn- + onoma, onuma, name; see n-men- in the Appendix of Indo-European roots.]
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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.