Prover
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
In old English law
One who undertakes to prove a crime against another.
28 Edw. I.; 5 Hen. IV.
One who, being indicted and arraigned for treason or felony, confesses before plea pleaded, and. accuses his accomplices to obtain pardon; state's evidence.
4 Bl. Comm. 329, 330*.