Pol″y‐type (?), n. [Poly- + -type.] (Print.) A cast, or facsimile copy, of an engraved block, matter in type, etc. (see citation); as, a polytype in relief.
By pressing the wood cut into semifluid metal, an intaglio matrix is produced: and from this matrix, in a similar way, a polytype in relief is obtained. Hansard.