Webster's English Dictionary

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dam

1. dam \'dam\ n [ME dam, dame lady, dam - more at DAME] : a female parent - 
   used esp. of a domestic animal 
2. dam n [ME] 1a: a barrier preventing the flow of water; esp : a barrier 
   built a cross a watercourse 1b: a barrier to check the flow of liquid, gas, 
   or air  2: a body of water confined by a dam 
3. dam vt or dammed;  or dam.ming 1: to provide or restrain with a dam  2: 
   to stop up : BLOCK