A lover, especially a lover of a person who is married to someone else.
[Middle English, from par amour, by way of love, passionately, from Anglo-Norman : par, by (from Latin per; see per1 in the Appendix of Indo-European roots) + amour, love (from Latin amor, from amāre, to love).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.