Precariae
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
or PRECES (Law Lat.) In old English law. Days' works, which the tenants of some manors were bound, by which Spelman supposes to be a corruption of "biden days," which in Saxon, answered to dies precariae (literally, pray days, or praiyed days), the Saxon biden signifying to pray. Spelman; Cowell.