Webster's English Dictionary

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cog

1. cog \'ka:g\ \'ka:gd\ n [ME cogge, of Scand origin; akin to Norw kug cog; 
   akin to OE cyc]gel cudgel 1: a tooth on the rim of a wheel or gear  2: a 
   subordinate person or part  - cogged aj
2. cog vb or cogged;  or cog.ging [cog (a trick)] obs  1: to cheat in 
   throwing dice  obs  2: DECEIVE  obs  3: to use venal flattery  1: to direct 
   the fall of (dice) fraudulently  obs  2: WHEEDLE 
3. cog vb or cogged;  or cog.ging [prob. alter. of cock (cog)] : to connect 
   by means of tenons 
4. cog n : a tenon on a beam or timber received into a mortise in another 
   beam to s ecure the two together