peridot

[per-i-doh, -dot]
noun Mineralogy.
a green transparent variety of olivine, used as a gem.

Origin:
1300–50; < French péridot; replacing Middle English peritot < Middle French

peridotic [per-i-dot-ik, -doh-tik] , adjective
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World English Dictionary
peridot (ˈpɛrɪˌdɒt)
 
n
a pale green transparent variety of the olivine chrysolite, used as a gemstone
 
[C14: from Old French peritot, of unknown origin]

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Example sentences
Room are individually decorated and are named for different gemstones, such as amethyst, peridot and garnet.
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