quid in WordNet English dictionary

1. the basic unit of money in Great Britain and Northern Ireland; equal to 100 pence
   British pound  pound  British pound sterling  pound sterling  quid 
   
2. a wad of something chewable as tobacco
   chew  chaw  cud  quid  plug  wad 
   
3. something for something; that which a party receives (or is promised) in return for something he does or gives or promises
   quid pro quo  quid