Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A lustrous yellow, green, or black mineral, Ca2(Al, Fe)3(SiO4)3OH, commonly found in metamorphic rock.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a class of mixed calcium iron aluminium sorosilicates found in metamorphic rocks

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A common mineral, occurring in prismatic crystals belonging to the monoclinic system, also massive, generally of a pistachio-green color and of a vitreous luster.

Etymologies

French épidote, from Greek epididonai, to give in addition, increase (from the greater length of its crystals compared with those of related minerals) : epi-, epi- + didonai, to give.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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