Deuce

Deuce (dūs), n. [F. deux two, OF. deus, fr. L. duo. See Two.] 1. (Gaming) Two; a card or a die with two spots; as, the deuce of hearts.

2. (Tennis) A condition of the score beginning whenever each side has won three strokes in the same game (also reckoned "40 all"), and reverted to as often as a tie is made until one of the sides secures two successive strokes following a tie or deuce, which decides the game.

Deuce, n. [Cf. LL. dusius, Armor, dus, teûz, phantom, specter; Gael. taibhs, taibhse, apparition, ghost; or fr. OF. deus God, fr. L. deus (cf. Deity).] The devil; a demon. [A euphemism, written also deuse.] [Low]