peridotite

noun pe·ri·do·tite \pə-ˈri-də-ˌtīt\

Definition of PERIDOTITE

: any of a group of granular igneous rocks composed of ferromagnesian minerals and especially olivine

— pe·ri·do·tit·ic \pə-ˌri-də-ˈti-tik\ adjective

French péridotite, from péridot

First Known Use: 1878

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