duodenary
adjective
du·o·den·a·ry
¦d(y)üə¦denərē,
-dēn-
1
: containing 12
a duodenary cycle of years
2
: based on the number 12
a duodenary system of computation
Word History
Etymology
Latin duodenarius, from duodeni twelve each (from duodecim twelve) + -arius -ary