General

A hot-formed bolt covered with black scale, not of uniform diameter; used in steel construction.

1. A body whose radiation at each wavelength is the maximum possible for any electromagnetic radiator at that temperature. 2.

A mixture of high-calcium lime, water, and ashes or clinker which relies on its pozzolanic properties for its hard set.

On drawings, abbr. for book shelves

In military architecture, a pair of defensive ditches and earth embankments, usually concentric, that surround a mound or medieval fort.

A dark-colored varnish (either of the oil or spirit type) that contains bituminous ingredients.

A low-cost paint containing asphalt or coal tar, a thinner, and drying oils; used to waterproof concrete and to protect