From WordNet (r) 3.0 (2006):
quid
n 1: the basic unit of money in Great Britain and Northern
Ireland; equal to 100 pence [syn: British pound, pound,
British pound sterling, pound sterling, quid]
2: something for something; that which a party receives (or is
promised) in return for something he does or gives or
promises [syn: quid pro quo, quid]
3: a wad of something chewable as tobacco [syn: chew, chaw,
cud, quid, plug, wad]