Ulna Ferrea
Defined in 2 dictionaries — Cyclopedic (1922), Black's (1910)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The standard ell of iron, which was kept in the exchequer for the rule of measure. Mon. Angl. ii. 383.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In-Lat.
In old English law. The iron ell; the standard ell of iron, kept in the exchequer for the rule of measure.