1. 
   whipstock
   a long steel casing that uses an inclined plane to cause the bit to deflect from the original borehole at a slight angle. Whipstocks are sometimes used in controlled directional drilling, in straightening crooked boreholes, and in sidetracking to avoid unretrieved fish.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   Whipstock
   Whip'stock` noun The rod or handle to which the lash of a whip is fastened.
   Found op http://www.encyclo.co.uk/webster/W/32
   
   
3. 
   Whipstock
   • (n.) The rod or handle to which the lash of a whip is fastened.
   Found op http://thinkexist.com/dictionary/meaning/whipstock/
   
   
4. 
   whipstock
   (from the article `petroleum production`) ...a number of small deviations must be made. The borehole, in effect, ends up making a large arc to reach its objective. The traditional tool for ...
   Found op http://www.britannica.com/eb/a-z/w/29
   
   

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