streptococci, marked by fever and joint pain. Associated with
polyarthritis, Sydenham's chorea, and endocarditis; frequently causes
scarring of the heart valves.

rheumatism
Painful disorder of the joints or muscles or connective tissues. Chronic
auto-immune disease with inflammation of the joints and marked
deformities.

rhus
Genus of vines and shrubs including poison ivy, poison oak, and poison
sumac.

rickets (rachitis)
Childhood disease caused by a lack of vitamin D or calcium and from
insufficient exposure to sunlight, characterized by defective bone
growth.

Rochelle salts
Potassium sodium tartrate; colorless efflorescent crystalline compound,
KNaC4H4O6.4H2O, used in making mirrors, in electronics, and as a
laxative

ruche
Ruffle or pleat of lace, muslin, or other fine fabric used to trim
women's garments.

rumex Crispus (chrysophanic acid)
Yellow crystalline substance found in the root of yellow dock (Rumex
crispus).