Source : Webster's Revised Unabridged Dictionary (1913)

Quid \Quid\, n. [Etym. uncertain.]
   An English coin, a sovereign. [Slang, Eng.]

         They invited him to come to-morrow, . . . and bring
         half a quid with him.                    --Charles
                                                  Reade.

Quid \Quid\, n. [See {Cud}.]
   A portion suitable to be chewed; a cud; as, a quid of
   tobacco.

Quid \Quid\, v. t. (Man.)
   To drop from the mouth, as food when partially chewed; --
   said of horses. --Youatt.

Source : WordNet®

quid
     n 1: the basic unit of money in Great Britain; equal to 100 pence
          [syn: {British pound}, {pound}, {pound sterling}]
     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}]
     3: a wad of something chewable as tobacco [syn: {chew}, {chaw},
         {cud}, {plug}, {wad}]