Webster's English Dictionary

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deuce

1. deuce \'d(y)u:s\ n [MF deus two, fr. L duos, acc. masc. of duo two - 
   more at (] [obs. E deuce bad luckMTWO 1a1: the face of a die that bears two 
   spots  1a2: a playing card bearing an index number two  1b: a cast of dice 
   yielding a point of two  2: a tie in tennis with each side having a score 
   of 40  3a: DEVIL, DICKENS - used chiefly as a mild oath  3b: something 
   notable of its kind 
2. deuce vt : to bring the score of (a tennis game or set) to deuce