Source : Webster's Revised Unabridged Dictionary (1913)

Jasper \Jas"per\, n. [OE. jaspre, jaspe, OF. jaspre, jaspe, F.
   jaspe, L. iaspis, Gr. ?; cf. Per. yashp, yashf, Ar. yashb,
   yasb, yasf, Heb. y[=a]shpheh. Cf. {Diaper}.] (Min.)
   An opaque, impure variety of quartz, of red, yellow, and
   other dull colors, breaking with a smooth surface. It admits
   of a high polish, and is used for vases, seals, snuff boxes,
   etc. When the colors are in stripes or bands, it is called
   {striped or banded jasper}. The Egyptian pebble is a brownish
   yellow jasper.

   {Jasper opal}, a yellow variety of opal resembling jasper.

   {Jasper ware}, a delicate kind of earthenware invented by
      Josiah Wedgwood. It is usually white, but is capable of
      receiving color.

Source : WordNet®

jasper
     n : an opaque form of quartz; red or yellow or brown or dark
         green in color; used for ornamentation or as a gemstone