A deep red garnet, Mg3Al2Si3O12, used as a gem.
[Middle English pirope, from Old French, from Latin pyrōpum, gold-bronze alloy, from Greek purōpos, fiery, kind of red bronze : puro-, pyro- + ōps, ōp-, eye, face; see okw- in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendicies
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.