Quadrans
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Lat. In Roman law. The fourth part; the quarter of any number, measure, or quantity. Hence an heir to the fourth part of the inheritance was called "hæres ex quadrante." Also a Roman coin, being the fourth part of an as, equal in value to an English' half-penny.
In old English law
A farthing; a fourth part or quarter of a penny.