Collins Concise English Dictionary © HarperCollins Publishers::

jasper /ˈdʒæspə/ n
  1. an opaque impure microcrystalline form of quartz, red, yellow, brown, or dark green in colour, used as a gemstone and for ornamental decoration
  2. Also called: jasper ware a dense hard stoneware, invented in 1775 by Wedgwood, capable of being stained throughout its substance with metallic oxides and used as background for applied classical decoration
Etymology: 14th Century: from Old French jaspe, from Latin jaspis, from Greek iaspis, of Semitic origin; related to Assyrian ashpū, Arabic yashb, Hebrew yāshpheh



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