Source : Webster's Revised Unabridged Dictionary (1913)
Duodecimal \Du`o*dec"i*mal\, a. [L. duodecim twelve. See
{Dozen}.]
Proceeding in computation by twelves; expressed in the scale
of twelves. -- {Du`o*dec"i*mal*ly}, adv.
Duodecimal \Du`o*dec"i*mal\, n.
1. A twelfth part; as, the duodecimals of an inch.
2. pl. (Arch.) A system of numbers, whose denominations rise
in a scale of twelves, as of feet and inches. The system
is used chiefly by artificers in computing the superficial
and solid contents of their work.
Source : WordNet®
duodecimal
adj : based on twelve; "the duodecimal number system"