Of a book, film, etc.: guaranteed to succeed even if it receives unfavourable reviews.

(idiomatic) A real-life person or thing which demonstrates the validity of a hypothesis.

(typography, now chiefly historical) A temporary print made from a thin coating of carbon deposited on the punch surface by a candle flame, used in evaluating the progress of the design of the punch.

plural of proof charge

plural of proof system

Unable to be affected or damaged by heat.

Unable to be scratched.

Alternative form of squirrelproof.

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

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