\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.

\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.