peridot noun. ['pɛrɪdɒt] ME.
[Old French peritot (mod. -dot) = medieval Latin peridotus, of unkn. origin. In sense 2 readopted from French.]
1. A green gemstone. Only in ME.
2. Olivine (chrysolite), esp. as used as gem. E18.

■ peridotite noun (Geology) any of the group of plutonic rocks containing little or no feldspar but much olivine L19.

■ peridotitic [-'tɪt-] adjective containing, consisting of, or resembling peridotite L19.

[TahlilGaran] English Dictionary ▲