py·ri·tes (pī-rītēz, pīrīts′)
n. pl. pyrites
Any of various natural metallic sulfide minerals, especially of iron.
[Latin pyrītēs, from Greek purītēs (lithos), fire (stone), flint, from pūr, fire; see paəw 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.