duodenal smear
- n alimentary tract smear of material obtained from the duodenum
duo
- n two items of the same kind
- n two performers or singers who perform together
- n a pair who associate with one another
- n a musical composition for two performers
duodecimal notation
- n any notation that uses 12 different characters
duodecimal number system
- n a positional system of numeration that uses duodecimal digits and a radix of twelve