Webster's English Dictionary

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gasket

gas.ket \'gas-k*t\ n [prob. alter. of F garcette] 1: a line or band used to 
   lash a furled sail  2a: plaited hemp or tallowed rope for packing pistons 
   or making pipe or oth er joints fluid-tight 2b: packing for the same 
   purpose made of other material (as rubber)