1. a hard stone, a form of silica resembling chalcedony but more opaque, less pure, and less lustrous.
  2. a piece of this, especially as used for striking fire.
  3. a chunk of this used as a primitive tool or as the core from which such a tool was struck.
  4. something very hard or unyielding.
  5. a small piece of metal, usually an iron alloy, used to produce a spark to ignite the fuel in a cigarette lighter.

verb (used with object)

  1. to furnish with flint.


  1. a town in NE Wales, in Flintshire, on the Dee estuary. Pop: 11 936 (2001)
  2. a city in SE Michigan: closure of the car production plants led to a high level of unemployment. Pop: 120 292 (2003 est)


  1. an impure opaque microcrystalline greyish-black form of quartz that occurs in chalk. It produces sparks when struck with steel and is used in the manufacture of pottery, flint glass, and road-construction materials. Formula: SiO 2
  2. any piece of flint, esp one used as a primitive tool or for striking fire
  3. a small cylindrical piece of an iron alloy, used in cigarette lighters
  4. Also called: flint glass, white flint colourless glass other than plate glass
  5. See optical flint


  1. (tr) to fit or provide with a flint

Old English flint “flint, rock,” common Germanic (cf. Middle Dutch vlint, Old High German flins, Danish flint), from PIE *splind- “to split, cleave,” from root *(s)plei- “to splice, split” (cf. Greek plinthos “brick, tile,” Old Irish slind “brick”). Transferred senses were in Old English.

  1. A very hard, gray to black variety of chalcedony that makes sparks when it is struck with steel. It breaks with a conchoidal fracture.
  2. The dark gray to black variety of chert.
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