duo

Multiple Entries:
  duo    duo-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
duo/ˈdjuːəʊ/

▶noun (pl. duos)

• 1 a pair of people or things, especially in music or entertainment.

• 2 Music a duet.

– origin C16: via Ital. from L. duo ‘two’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
duo-/ˈdjuːəʊ/

▶combining form two; having two: duopoly.

– origin from L.