Main Entry: ep·i·dote

Pronunciation: \ˈe-pə-ˌdōt\

Function: noun

Etymology: French épidote, from Greek epididonai to give in addition, from epi- + didonai to give — more at date

Date: 1808

: a yellowish-green mineral Ca₂(Al,Fe)₃Si₃O₁₂OH usually occurring in grains or columnar masses and sometimes used as a gemstone