The Collaborative International Dictionary of English v.0.48:

Peridot \Per"i*dot\, n. [F. p['e]ridot.] (Min.)
   Chrysolite.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chrysolite \Chrys"o*lite\, n. [L. chrysolithos, Gr. ?; chryso`s
   gold + ? stone: cf. F. chrysolithe.] (Min.)
   A mineral, composed of silica, magnesia, and iron, of a
   yellow to green color. It is common in certain volcanic
   rocks; -- called also olivine and peridot. Sometimes used
   as a gem. The name was also early used for yellow varieties
   of tourmaline and topaz.
   [1913 Webster]

WordNet (r) 3.0 (2006):

peridot
    n 1: a pale green variety of chrysolite; used as a gemstone