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Rochelle Salts
- a double salt used in Seidlitz powder; acts as a cathartic
Rochelle Powder
- an effervescing salt containing sodium bicarbonate and Rochelle salt and tartaric acid; used as a cathartic
Rh Factor
- a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia
Recent Epoch
- approximately the last 10,000 years
Roman Calendar
- the lunar calender in use in ancient Rome; replaced by the Julian calendar in 46 BC
Revolutionary Calendar
- the calendar adopted by the first French Republic in 1793 and abandoned in 1805; dates were calculated from Sept. 22, 1792
Revolutionary Calendar Month
- a month in the Revolutionary calendar
Robert E Lee's Birthday
- celebrated in southern United States
Robert E Lee Day
- celebrated in southern United States