quinine Bitter, colorless, powder or crystalline alkaloid, C20H24N2O2-3H2O, derived from cinchona barks and used to treat malaria. quince Western Asian shrub or tree (Cydonia oblonga) with white flowers and hard apple-like fruit. quinsy Acute inflammation of the tonsils and surrounding tissue, often leading to an abscess. rabies see hydrophobia ranunculus bulbosus Perennial Old World buttercup with yellow flowers in late spring to early summer. red precipitate Mercuric oxide (HgO) a heavy red crystalline powder formed by heating mercuric nitrate, or by heating mercury in the air. repousse Ornamented with patterns in relief made by pressing or hammering on the reverse side; resorcinol (resorcin) White crystalline compound, C6H4(OH)2, used to treat certain skin diseases and in dyes, resin adhesives, and pharmaceuticals. Rhamnus Purshiana (Cascara buckthorn ) Buckthorn of the Pacific coast of the United States, which yields cascara sagrada. rhatany Dried root of South American shrubs (Krameria lappacea or K. argentea) used as an astringent and in toothpaste and mouthwash. rheumatic fever Acute inflammatory disease occurring after an infection from group A 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). rush Stiff marsh plants of the genus Juncus, having pliant hollow or pithy stems and small flowers with scale-like perianths (outer envelope of a flower,). sago Powdery starch from the trunks of sago palms; used in Asia as a food thickener and textile stiffener. sal-ammoniac ammonium chloride; white crystalline volatile salt NH4Cl, used in dry cells and as an expectorant called. saleratus Sodium or potassium bicarbonate used as a leavening agent; baking soda. salicylate Salt or ester of salicylic acid. salicylic acid White crystalline acid, C6H4(OH)(COOH), used to make aspirin and to treat skin conditions such as eczema.