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tinnitus

(Encyclopedia)tinnitus, the hearing of sounds in the absence of any external sound, also known as ringing in the ears. The sounds may be perceived as hissing, whistling, buzzing, swooshing, roaring, or clicking in ...

St.-John's-wort

(Encyclopedia)St.-John's-wort, any species of the large and widespread herbaceous or shrubby genus Hypericum of the family Hypericaceae (St.-John's-wort family), usually found in moist, open places and often having...

South Dakota

(Encyclopedia)CE5 South Dakota dəkōˈtə [key], state in the N central United States. It is bordered by North Dakota (N), Minnesota and Iowa (E), Nebraska (S), and Wyoming and Montana (W). ...

Faiyum, El

(Encyclopedia)Faiyum, El fīyo͞omˈ [key], region, coextensive with El Faiyum governorate, N Egypt, W of the Nile River, a depression (entirely below sea level) in the Libyan (or Western) Desert. It is an irrigat...

Kristeva, Julia

(Encyclopedia)Kristeva, Julia, 1941–, French critic, psychoanalyst, semiotician, and writer, b. Sliven, Bulgaria. Writing in French, she has explored many subjects including structuralist linguistics and semiotic...

caffeine

(Encyclopedia)caffeine kăfēnˈ [key], odorless, slightly bitter alkaloid found in coffee, tea, kola nuts (see cola), ilex plants (the source of the Latin American drink maté), and, in small amounts, in cocoa (se...

scopolamine

(Encyclopedia)scopolamine hīˈəsēnˌ, –sĭn [key], alkaloid drug obtained from plants of the nightshade family (Solanaceae), chiefly from henbane, Hyoscyamus niger. Structurally similar to the nerve substance ...

Soyer

(Encyclopedia)Soyer, three brothers, American painters, emigrated with their family from Russia in 1912. Two were twins, Raphael Soyer, 1899–1987, and Moses Soyer, 1899–1974, b. Borisoglebsk. They settled in Ne...

Shays's Rebellion

(Encyclopedia)Shays's Rebellion, 1786–87, armed insurrection by farmers in W Massachusetts against the state government. Debt-ridden farmers, struck by the economic depression that followed the American Revolutio...

Central America

(Encyclopedia)Central America, narrow, southernmost region (c.202,200 sq mi/523,698 sq km) of North America, linked to South America at Colombia. It separates the Caribbean from the Pacific. Historically, geographe...