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Term Definition
O/C. see OC.  
Oak Floor. A common type of flooring, usually installed in small tongue and groove strips made of oak.  
Oak Veneer. A thin layer of oak glued to an interior wood or bonded together to form a protective or ornamental facing; types available are white oak and red oak.  
Oak. A strong, hard, heavy wood.  
Oakum. Loosely twisted jute or hemp fiber impregnated with tar and used in caulking seams, as in wood shipbuilding or in caulking cast iron bell and spigot piping.  
Oatmeal Paper. Wallpaper made by sprinkling sawdust over adhesive surface.  
OB. Octave Band.  
Obelisk. A tall, slender, tapering, usually 4-sided, stone monument surmounted by a pyramid, of Egyptian origin.  
Oblique Slip Fault. A combination of normal and slip or thrust and slip faults whose movement is diagonal along the dip of the fault plane.  
Oblique. 1. An angle; neither parallel or perpendicular. 2. Not symmetrical with its base.  
Obscure Glass. Ground glass or frosted glass that transmits light but does not allow a view of objects on the other side.  
Obsolescence. The loss of value due to being no longer useful.  
Obtuse Angle. An angle of over 90 degrees but less than 180 degrees.  
Obtuse Triangle. A triangle having one angle over 90 degrees.  
OC. 1. On center; the designation of spacing for framing members in a building from the center of one member to the center of the next; also shown as O/C. 2..See Oxygen Cutting.  
Occupancy Importance Factor (I). A building code term used to identify occupancies of importance.  
Occupancy. A building code term referring to the use of a building, such as school, office, restaurant, warehouse, or residence.  
Occupational Safety & Health Administration (OSHA U.S. Department of Labor/OSHA, 200 Constitution Avenue, NW, Washington DC, (202) 219-7725.  
Ochre. An earth pigment, usually red or yellow, made from impure iron ore, used in paint.  
Octave. Frequency difference between harmonic vibrations; it is the doubling of the frequency of sound.  
Octyl Alcohol-Ethyl Hexanol. Additive in absorption machines to rce surface tension in the absorber.  
Oculus. 1. A circular opening or eye in a dome. 2. Any round window.  
OD. Outside Diameter.  
Odor. That property of air contaminants that affect the sense of smell.  
Off Cycle. That part of a refrigeration cycle when the system is not operating.  
Offer. A promise that is enforceable if accepted.  
Offeror. A person who makes an offer.  
Office Building. A building containing business offices.  
Office Cubicle. A small compartment unit, surrounded by fixed or movable walls on two or three sides, where an individual works.  
Office Park. A planned, usually suburban, community of office buildings with common management, parking, landscaping, and other services.  

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