deuce
- n a tie in tennis or table tennis that requires winning two successive points to win the game
- n the cardinal number that is the sum of one and one or a numeral representing this number
- n a word used in exclamations of confusion
the deuce with it - n one of the four playing cards in a deck that have two spots
deuce-ace
- n the cardinal number that is the sum of one and one and one
deus ex machina
- n any active agent who appears unexpectedly to solve an insoluble difficulty
deuteranopia
- n dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red