epi- or ep-
1. On; upon: epiphyte.
2. Over; above: epicenter.
3. Around: epicarp.
4. Close to; near: epicalyx.
5. Besides: epiphenomenon.
6. After: epilogue.
7. Chemistry Epimer of: epitestosterone.
[Greek, from epi, upon; see epi in the Appendix of Indo-European roots.]
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.