flint /ˈflɪnt/
 打火石,燧石,極硬的東西
 Flint n.
 1. Min. A massive, somewhat impure variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.
 2. A piece of flint for striking fire; -- formerly much used, esp. in the hammers of gun locks.
 3. Anything extremely hard, unimpressible, and unyielding, like flint. “A heart of flint.”
 Flint age. Geol. Same as Stone age, under Stone.
 Flint brick, a fire made principially of powdered silex.
 Flint glass. See in the Vocabulary.
 Flint implements Archæol., tools, etc., employed by men before the use of metals, such as axes, arrows, spears, knives, wedges, etc., which were commonly made of flint, but also of granite, jade, jasper, and other hard stones.
 Flint mill. (a) Pottery A mill in which flints are ground. (b) Mining An obsolete appliance for lighting the miner at his work, in which flints on a revolving wheel were made to produce a shower of sparks, which gave light, but did not inflame the fire damp. --Knight.
 Flint stone, a hard, siliceous stone; a flint.
 Flint wall, a kind of wall, common in England, on the face of which are exposed the black surfaces of broken flints set in the mortar, with quions of masonry.
 Liquor of flints, a solution of silica, or flints, in potash.
 To skin a flint, to be capable of, or guilty of, any expedient or any meanness for making money. [Colloq.]
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 flint
      n 1: a hard kind of stone; a form of silica more opaque than
           chalcedony
      2: a river in western Georgia that flows generally south to
         join the Chattahoochee River at the Florida border where
         they form the Apalachicola River [syn: Flint River]
      3: a city in southeast central Michigan near Detroit;
         automobile manufacturing
 Flint
    abounds in all the plains and valleys of the wilderness of the
    forty years' wanderings. In Isa. 50:7 and Ezek. 3:9 the
    expressions, where the word is used, means that the "Messiah
    would be firm and resolute amidst all contempt and scorn which
    he would meet; that he had made up his mind to endure it, and
    would not shrink from any kind or degree of suffering which
    would be necessary to accomplish the great work in which he was
    engaged." (Comp. Ezek. 3:8, 9.) The words "like a flint" are
    used with reference to the hoofs of horses (Isa. 5:28).