Main Entry: pe·ri·do·tite

Pronunciation: \pə-ˈri-də-ˌtīt\

Function: noun

Etymology: French péridotite, from péridot

Date: 1878

: 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