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Term Definition
Amplification. An increase in earthquake motion as a result of resonance of the natural period of vibration with that of the forcing vibration.  
Amplifier. An electrical device to obtain amplification of voltage, current or power.  
Amplitude. Maximum deviation from mean or center line of a wave.  
Amyl Acetate. Banana oil; solvent for nitrocellulose, formed by esterification of acetic acid with amyl alcohol.  
Anaerobic. An organism that can live without oxygen, such as the bacteria in a septic tank.  
Anaglyph. A sculptured, chased, or embossed ornament worked in low relief.  
Analog. A way of expressing one quantity in terms of another quantity; an analogous or parallel thing; for example, voltage, weight, or length to represent numbers, as watch hands represent time; compare with Digital.  
Analogous Harmony. Colors which are related by containing one color in common; color harmony.  
Analogy. Inference from a similar case.  
Analysis . 1. Separation into constituent parts. 2. In engineering, the investigative determination of the detailed aspects of a particular phenomenon; may be qualitative, meaning a general evaluation of the nature of the phenomenon, or quantitative, meaning the numerical determination of the magnitude of the phenomenon.  
Anchor Bolt. A bolt embedded in concrete for the purpose of fastening a building frame to a concrete or masonry foundation.  
Anchor Pattern. Profile surface roughness usually attained by blasting.  
Anchor Slot. A groove in an object into which a fastener or connector isINSERTed to attach objects together.  
Anchor Tenant. The main tenant in a shopping center development; a large stable tenant or tenants that are expected to attract other tenants and customers to the development.  
Anchor Ties. Any type of fastener used to secure wood framing, steel, or masonry to some stable object, such as a foundation or another wall; usually for tension value.  
Anchor, Brick. Fasteners that are designed to attach and secure a veneer to a concrete or brick wall.  
Anchor, Dovetail. A fastener with an interlocking joint that is wider at its end than at its base.  
Anchor, Rafter. A bolt or fastening device which attaches the rafters to the walls or rafter plate.  
Anchor, Wood. A bolt or fastening device which attaches wood to wood or wood to other materials.  
Anchor. Irons or metals of special form and shapes used to fasten together and secure timbers or masonry.  
Anchorage. 1. An attachment for resistance to movement; the movement can be a result of overturning, sliding or uplift; the most common anchorage for these movements are tie-downs (hold-downs) for overturning and uplift, and anchor bolts for sliding. 2. In posttensioning, a device used to anchor tendons to concrete member; in pretensioning, a device used to anchor tendons during hardening of concrete. 3. The securing of reinforcing bars in cast-in-place concrete either by hooks, bends, or embedment length.  
Anchored Type Ceramic Veneer. Thicker sections of ceramic veneer held in place by grout and wire anchors connected to backing wall.  
Anchoring Cement. Grout used in sleeves to anchor tubing in place.  
Andalusite. A polymorph, along with sellimanite and kyanite, of composition Al2O3SiO2; in firing, it dissociates to yield principally mullite.  
Andiron. A metal stand, usually a pair, for supporting wood fuel in a fireplace.  
Anechoic Chamber. A room or building that is free from echoes and reverberations.  
Anemometer. Instrument for measuring the rate of air flow or motion.  
Aneroid Barometer. An instrument for measuring atmospheric air pressure by its action on the elastic lid of an evacuated box. This is the basis of a surveyors aneroid barometer which is used to measure altitude; an altimeter.  
Anesthetizing Location. Areas in hospitals in which flammable anesthetics are or may be administered to patients; such locations include operating rooms, delivery rooms, and anesthesia rooms, and will also include any corridors, utility rooms or other areas which are or may be used for administering flammable anesthetics to patients.  
Angle Bar. A steel structural member in the shape of an L; classified by the thickness of the stock and the length of the legs.  

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