duo (duo)

[It., a duet, also two, (Lord's Day.) Up, and, while I staid for the barber, tried to compose a duo of counter point: and I think it will do very well, it being by Mr. Berkenshaw's rule. Pepys , Diary, II. 312. duo-. [L. duo-, duo, = Gr. δυο-, δύο = E. two.] A prefix in words of Latin or Greek origin, meaning 'two.' duo decahedral, duo decahedron' (du-o-dek-ahe'dral, -dron). See dodecahedral, dodecahedron.