Ep"i*dote (?), n. [Gr. to give besides; over + to give: cf. F. 'epidote. So named from the enlargement of the base of the primary, in some of the secondary forms.] Min.
A mineral, commonly of a yellowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.
⇒ The Epidote group includes ordinary epidote, zoisite or lime epidote, piedmontite or manganese epidote, allanite or serium epidote.
© Webster 1913.