duo-, du- (Latin: two; a number used as a prefix).conduplicate: 
deuce: 
double: 
doubloon: 
doubt: 
duagenarian, duogenarian, duagenary, duogenary: 
A reference to a person who is twenty to twenty-nine years old; someone who is in his/her twenties.
 
dual: 
dualism: 
dualist: 
dualistic: 
duality: 
dualize: 
dualpurpose: 
duarchy: 
dubious: 
duet: 
dulogue: 
duo: 
duodecennial: 
duodecimal: 
duomachy: 
duopoly: 
duotone: 
duple: 
duplex: 
duplexity: 
duplicate: 
duplication: 
duplicative: 
duplicator: 
duplicities: 
duplicitous: 
duplicity: 
indubitable: 
reduplicate: 
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