Opus

Lat. Work; labor; the product of work or labor.

— Opus locatum. The product of work let for use to another; or the hiring out of work or labor to be done upon a thing.

— Opus maul ificum. In old English law. Labor done by the hands; manual labor; such as making a hedge, digging a ditch. Fleta, lib. 2, c. 48, § 3.

— Opus novum. In the civil law. A new work. By this term was meant something newly built upon land, or taken from a work already erected. He was said opus novum faeere (to make a new work) who, either by building or by taking anything away, changed the former appearance of a work. Dig. 39, 1, 1, 11.