[doo-oh, dyoo-oh]
noun, plural duos.
Music. duet.
two persons commonly associated with each other; couple.
two animals or objects of the same sort; two things ordinarily placed or found together; a pair: a duo of lovebirds.

1580–90; < Italian < Latin: two

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a combining form meaning “two,” used in the formation of compound words: duologue.

combining form of Greek dýo, Latin duo two

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
duo (ˈdjuːəʊ)
n , pl duos, dui
1.  music
 a.  a pair of performers
 b.  another word for duet
2.  a pair of actors, entertainers, etc
3.  informal a pair of closely connected individuals
[C16: via Italian from Latin: two]

combining form
indicating two: duotone
[from Latin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1590 "song for two voices," via either It. or Fr. from L. duo "two."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The narrative shifts constantly between the perspectives of the travelling duo.
Pecorino's fame has garnered the duo some unusual privileges.
The duo of smartphones were used to test and investigate how humans and robots
  can coexist in space more efficiently.
Genetic variation and natural selection are evolution's powerful duo.
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