| 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: |