memento mo·ri (môrē)
n. pl. memento mori
1. A reminder of death or mortality, especially a death's-head.
2. A reminder of human failures or errors.
[New Latin mementō morī, be mindful of dying : Latin mementō, sing. imperative of meminisse, to remember + Latin morī, to die.]
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.