Webster's English Dictionary

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caulk

1. caulk \'ko.k\ vt [ME caulken, fr. ONF cauquer to trample, fr. L calcare, 
   fr. (Xcalc-, calx heel 1: to stop up amd make watertight the seams of by 
   filling with a waterproo fing compound or material 2: to stop up and make 
   tight against leakage  - caulk.er n
2. caulk  var of CALK