peridot

Borrowed from Anglo-Norman peridou, peridout, Middle French perido, peridon, of uncertain origin; later reborrowed from modern French péridot.

Peridot

• (Received Pronunciation) IPA^(key): /ˈpɛɹɪdɒt/, /ˈpɛɹɪdəʊ/
• (General American) IPA^(key): /ˈpɛɹɪdɑt/, /ˈpɛɹɪdoʊ/

peridot (countable and uncountable, plural peridots)

1. A transparent olive-green form of olivine, used as a gem.
   • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 51:

     Gem-quality olivine is known as peridot, which has a subtle green light all its own.

   • 2012 March 1, Lee A. Groat, “Gemstones”, in American Scientist‎, volume 100, number 2, page 128:

     Although there are dozens of different types of gems, among the best known and most important are  […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)

2. A yellow-green colour, like that of the peridot.

   peridot colour:  

• peridotite

• “Peridot” in David Barthelmy, Webmineral Mineralogy Database, 1997–.
• “peridot”, in Mindat.org‎, Hudson Institute of Mineralogy, accessed 29 August 2016.

• diopter, dioptre, proetid, proteid, protide, pterido-, pteroid, reptoid