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Richter Scale
- a logarithmic scale of 1 to 10 used to express the energy released by an earthquake
Rankine Scale
- a scale of absolute temperature in Fahrenheit degrees; the freezing point of water is 491.69 degrees and the boiling point of water is 671.69 degrees
Reaumur Scale
- a temperature scale on which water freezes at 0 degrees and boils at 80 degrees
Rh Incompatibility
- incompatibility of Rh blood types; a transfusion of Rh-positive blood given to a Rh-negative person (or vice versa) can result in hemolysis and anemia
Rem Sleep
- a recurring sleep state during which dreaming occurs; a state of Rapid Eye Movements during sleep
Riggs' Disease
- chronic periodontitis; purulent inflammation of the teeth sockets
Rock Fever
- infectious bacterial disease of human beings transmitted by contact with infected animals or infected meat or milk products; characterized by fever and headache
Rocky Mountain Spotted Fever
- caused by rickettsial bacteria and transmitted by wood ticks
Rift Valley Fever
- an infection common in Africa caused by a bunyavirus; transmitted by mosquitoes or by handling infected animals
Rhus Dermatitis
- contact dermatitis resulting from contact with plants of the genus Toxicodendron