apartment

A room or suite of rooms designed to be lived in, containing at least one bathroom; is separated from, and is usually one of, many similar units within a multiple dwelling. A building containing at least three such dwelling units; an apartment house. Also see efficiency apartment, garden apartment, apartment hotel.

apadana

The columnar audience hall in a Persian palace.

antistatic agent

An agent which minimizes static electricity in plastics; may consist of chemical additives or metallic devices connected to an electrical ground.

antismudge ring

A frame attached around the perimeter of a ceiling-mounted air diffuser, which minimizes the formation of rings of dirt on the ceiling.

antislip paint

A paint with a high coefficient of friction, caused by addition of sand, wood flour, or cork dust; used on steps, porches, and walkways to prevent slipping.

antiquing

A technique of handling wet paint, by combing, graining, or marbling, so as to expose parts of the undercoat; also called broken-color work.

antique glass

A textured cylinder glass of uneven thickness, used primarily in stained glass windows; similar in characteristics to the stained glass of the Middle Ages.

anodize

To provide a hard, noncorrosive, electrolytic, oxide film on the surface of a metal, particularly aluminum, by electrolytic action.

anodic coating

The surface finish resulting from anodizing; may be transparent or colored by the use of a dye or pigment in the anodizing process.

anode

In an electric system to protect underground iron pipes or structures from electrochemical action, a metallic rod which is driven in the ground; direct current is passed through the rod to the earth, and then through the iron pipe or structure, in a direction opposite to that resulting from the electrochemical properties of the soil.