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Term Definition
Root Opening. In welding, the separation between the members to be joined at the root of the joint.  
Rope. A stout cord made by twisting or braiding together strands of hemp, sisal, flax, cotton, nylon, wire, or similar material.  
Rose. A trim plate attached to the door hardware behind the knob.  
Rosette. 1. A circular decorative ornament made of wood, metal, or plaster. 2. A metal trim at a ceiling mounted lighting fixture or at a blanked-off lighting fixture outlet.  
Rose-Window. A round window filled with tracery and, usually, stained glass; characteristic of Gothic churches.  
Rosewood Veneer. A thin layer of cabinet wood with a dark red or purplish color streaked and variegated with black, applied to give a superior and decorative surface.  
Rosin. A hard resin obtained from pine trees containing principally isomers of abietic acid; wood rosin is obtained from stump or dead wood, using steam distillation; gum rosin is obtained from the living treerosin is used in making varnish, soap, and solder flux.  
Rot. Decay.  
Rotary Blade Compressor. Mechanism for pumping fluid by revolving blades inside a cylindrical housing.  
Rotary Compressor. see Compressor, Rotary.  
Rotary-Cut Veneer. Veneer cut in a lathe which rotates a log or bolt, chucked in the center, against a knife.  
Rotate. To turn or revolve about an axis or center.  
Rotation. In building structures, the torsional movement of a diaphragm about a vertical axis.  
Rotisserie. 1. A restaurant specializing in roasted and barbecued meats. 2. A cooking device with a revolving spit for roasting and barbecuing meat.  
Rotor. A rotary part of a machine.  
Rottenstone. A siliceous limestone which when finely pulverized, is used in wood finishing; it has negligible cutting action but is fine for polishing; also called Tripoli.  
Rough Horse. see Carriage.  
Rough Lumber. Lumber that has not been dressed (surfaced) but which has been sawed, edged , and trimmed.  
Rough Opening. The clear dimensions of the framed opening that must be provided in a wall to accept a given door, window unit, or other unit.  
Rough- In. All work that must be performed before plastering.  
Round Edge. A preformed factory rounded edge design.  
Round Head Wood Screw (RHWS). A wood screw with a rounded head protruding above the surface; driven with a screw driver; usually installed with a washer under the head.  
Round Pattern. Circular spray pattern.  
Round Wire. see Loop Pile.  
Round, Quarter. see Quarter Round.  
Round. 1. Circular. 2. A wooden dowel.  
Rout. To gouge out or make a furrow in, as in wood.  
Router. Woodworking tool with a high speed bit for cutting rebates, dadoes, insetting butts, and forming decorative or rounded edges.  
Row House. One of a series of houses connected by common sidewalls and forming a continuous group.  
Rowlock Course. A course of headers laid on their edges instead of flat side; rows of brick laid on edge especially used for the ring of an arch.  

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