jasper

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An opaque cryptocrystalline variety of quartz that may be red, yellow, or brown.

from The Century Dictionary.

• Same as jasperize.
• noun Among the ancients, a bright-colored chalcedony (not, however, including carnelian), translucent and varying in color, green being apparently most common. It was highly esteemed as a precious stone.
• noun In modern usage, a closely compact crypto-crystalline variety of quartz, opaque or nearly so, and colored red, yellow, or brown, or less often green.
• noun An earthenware made of pounded spar.
• noun Same as jasper-ware.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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 jasper or banded jasper. The Egyptian pebble is a brownish yellow jasper.
• noun a yellow variety of opal resembling jasper.
• noun a delicate kind of earthenware invented by Josiah Wedgwood. It is usually white, but is capable of receiving color.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete Any bright-coloured kind of chalcedony apart from cornelian.
• noun mineralogy An opaque, impure variety of quartz, of red, yellow, and other dull colors, breaking conchoidally with a smooth surface.
• noun Jasperware pottery.
• noun UK, colloquial A wasp. (West Country dialects, Somerset County)
• noun US, slang A person, a guy, especially seen as naïve or simple.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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