Duodecimal

Part of speech: noun (n.)

1. A twelfth part; as, the duodecimals of an inch.

2. 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.

Part of speech: adjective (a.)

Proceeding in computation by twelves; expressed in the scale of twelves. -- Du`o*dec"i*mal*ly, adv.