intr.v. for·ni·cat·ed, for·ni·cat·ing, for·ni·cates
To commit fornication.
[Late Latin fornicārī, fornicāt-, from fornix, fornic-, vault, vaulted cellar, brothel; see gwher- 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.