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Term Definition
Direct Expansion Evaporator. Evaporator using either an automatic expansion valve (AEV) or a thermostatic expansion valve (TEV) refrigerant control.  
Direct Job Overhead. A firms overhead expense that is directly attributable to completing a work in process and that would not be incurred if no projects were under way.  
Direct Labor. The actual cost of labor payroll for all jobs worked on during the period covered by the income statement.  
Direct-Labor Burden. Includes all payroll taxes, insurance, and employees benefits which are associated with the labor payroll.  
Direct Methods. Techniques of solar heating in which sunlight enters a house through the windows and is absorbed inside.  
Direct Nailing. See Face-Nailing.  
Direct Process. See American Process Zinc Oxide.  
Direct Radiation. Solar radiation that comes straight from the sun, casting shadows on a clear day.  
Direct Transmission. Light passing through a clear, transparent material.  
Direction of Irrigation. Direction of flow of irrigation water; usually at right angles to the supply ditch or pipe.  
Directional Arrow. A symbol used to denote direction.  
Directional Sign. A publicly displayed notice which indicates by use of words or symbols a recommended direction or route of travel.  
Directory Board. A panel that is used to display information.  
Disability. 1. A physical or mental impairment that substantially limits one or more of the major life activities of an individual. 2. A record of such an impairment. 3. Being regarded as having such an impairment.  
Disappearing Stair. A folding, hinged stairway that is pulled down from the ceiling and commonly hidden in a trap door.  
Discharge Valve. A special purpose valve.  
Discharging Arch. An arch built over a lintel or header to help relieve the pressure from the wall above the arch; also known as a Relieving Arch or Safety Arch.  
Discoloration. Change of color from that which is normal or desired.  
Disconnect. An electrical switch.  
Disconnecting Means. A device, or group of devices, or other means whereby the conductors of a circuit can be disconnected from their source of supply.  
Discount. 1. A dction in price or the amount of a bill. 2. To sell a note for less than its principal sum; this has the effect of increasing the yield to the buyer.  
Discovery. A process in which parties to a lawsuit are required to divulge information.  
Dishwasher. An electric appliance for washing dishes.  
Disinfect Pipe. The act or process of transmitting an antimicrobial agent through a piping system.  
Disinfectant. Chemical (also called bacteriacide) used to destroy germs and bacteria.  
Disintegration. Decomposition into constituent elements or fragments.  
Disk Sander. An electric sanding tool where the sand paper abrasive is mounted on a rotating disk.  
Dismissal. The act of dropping a lawsuit.  
Dispensary. A building or place where medicines and medical or dental aid are dispensed.  
Dispenser, Tissue. See Tissue Dispenser.  

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