plural of proof of work

(business) A document that acts as evidence of someone having bought something, such as a receipt

plural of smoke proof

plural of page proof

plural of proof positive

plural of proof-of-concept

Alternative form of squirrelproof.

A small conductor attached to an insulated handle used to transfer electrical charge to a measuring instrument.

(humorous) Of a play or a dramatic part: sufficiently good that it should be able to succeed even with an inferior cast.

Proof that a hostage is still alive.