prover

One who or that which proves or tries.

A skilled workman employed to strike off proofs from engraved plates.

In homeopathic medicine, one who submits himself to experimentation in order to determine the therapeutic indications for a drug. See prove, v. t., 7.

In old English law, one who gives state’s evidence; an approver or probator.

One who, or that which, proves.

A person, device, or program that performs logical or mathematical proofs