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Roentgenoscope
- an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation
Roentgenoscopes
- an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation
Refractories
- lining consisting of material with a high melting point; used to line the inside walls of a furnace
Respirator
- a protective mask with a filter; protects the face and lungs against poisonous gases
- a breathing device for administering long-term artificial respiration
Respirators
- a protective mask with a filter; protects the face and lungs against poisonous gases
- a breathing device for administering long-term artificial respiration
Regulator
- a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
- any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
- an official responsible for control and supervision of a particular activity or area of public interest
Regulators
- a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
- any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
- an official responsible for control and supervision of a particular activity or area of public interest
Robe
- outerwear consisting of a long flowing garment used for official or ceremonial occasions
- any loose flowing garment
- clothe formally; especially in ecclesiastical robes
- cover as if with clothing; "the mountain was clothed in tropical trees"
Robes
- outerwear consisting of a long flowing garment used for official or ceremonial occasions
- any loose flowing garment
- clothe formally; especially in ecclesiastical robes
- cover as if with clothing; "the mountain was clothed in tropical trees"
Reef
- one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind
- a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese
- a submerged ridge of rock or coral near the surface of the water
- reduce (a sail) by taking in a reef
- roll up (a portion of a sail) in order to reduce its area
- lower and bring partially inboard; "reef the sailboat's mast"