Webster's English Dictionary

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impotent

Cross references:
  1. sterile               
 
im.po.tent \'im-p*t-*nt\ aj [ME, fr. MF & L; MF, fr. L impotent-, impotens, 
   fr. in-] + potent-, potens potent 1a: not potent : lacking in power, 
   strength, or vigor : HELPLESS  1b: unable to copulate; broadly : STERILE - 
   usu. used of m ales obs  2: incapable of self-restraint : UNGOVERNABLE  - 
   impotent n