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Term Definition
Oil Stain. A wood stain consisting of oil-soluble dyes and solvents such as turpentine, naphtha, or benzol,; penetrates into pores of wood; has tendency to bleed.  
Oil Switch. A switch or protector relay installed in a flue pipe, that will shut off a burner in case the stack does not come up to a predetermined temperature within 45 seconds after the motor starts.  
Oil Tank. The storage canister where heating oil is stored for future use by an oil boiler, or an oil burning furnace system.  
Oil Varnish. A varnish consisting of a hard resin combined with a drying oil and a drier thinned with a volatile solvent; after application, the solvent dries first by evaporation; then the oil dries by oxidation.  
Oil, Refrigeration. see Refrigeration Oil.  
Oil-Canning. Describing the distortion of thin-gauge metal panels that are fastened in a manner restricting normal thermal movement.  
Oilcloth Varnish. special highly flexible and elastic varnish.  
Oilstone. A whetstone used with oil.  
Oiticica Oil. Drying oil obtained from nut of oiticica tree.  
Old English Bond. see English Bond.  
Old Growth. Timber in or from a mature, naturally established forest. When the trees have grown during most if not all of their individual lives in active competition with their companions for sunlight and moisture, this timber is usually straight and relatively free of knots.  
Olefin Plastics. Plastics based on resins made by the polymerization of olefins or copolymerization of olefins with other unsaturated compounds, the olefins being in greatest amount by weight; polyethylene, polypropylene and polybutylene are the most common olefin plastics encountered in pipe.  
Olefin. Long-chained synthetic polymer composed of at least 85% by weight of ethylene, propylene or other olefin units; currently, only polypropylene has been produced in fiber form for carpet manufacture.  
Oleoresin. A solution of resin in an essential oil that occurs in or exudes from many plants, especially softwoods; the oleoresin from pine is a solution of pine resin (rosin) in turpentine.  
Oleoresinous Varnish. Varnish composed of resin or gum dissolved in a drying oil which hardens as it combines with oxygen from the air.  
Olive Knuckle Hinge. A paumelle hinge with knuckles forming an oval shape.  
On Center(O/C). Center to center.  
On the Stump. see Standing Timber.  
One Piece Toilet. A toilet where the water tank and bowl are cast in one piece of vitreous china for the purposes of quieter operation and better appearance.  
One-Family Dwelling. A dwelling containing only one dwelling unit.  
One-Way Action. The structural action of a slab that spans between two parallel beams or bearing walls.  
One-Way Concrete Joist System. A reinforced concrete framing system in which closely spaced concrete joists span between parallel beams or bearing walls.  
One-Way Glass. see Transparent Mirror.  
One-Way Solid Slab. A reinforced concrete floor or roof slab that spans between parallel beams or bearing walls, with structural reinforcing in the spanning direction only.  
One-Way. Constructed with reinforcing steel running in one direction only.  
On-Site. Objects and activities that are on the building site.  
Opacity. Hiding power, as of paint.  
Opaque Glaze. A non-transparent glaze with or without color.  
Opaque. Impervious to light; not transparent.  
Open Circuit. Electric circuit with a physical interruption caused by a switch, a break in a conductor, or an open breaker or fuse.  

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