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Seymour, Horatio

(Encyclopedia)Seymour, Horatio sēˈmôr, sēˈmər [key], 1810–86, American politician, b. Pompey Hill, N.Y. He studied law at Utica, N.Y. and was admitted to the bar in 1832. A Democrat, he was military secreta...

Dalhousie, James Andrew Broun Ramsay, 1st marquess of

(Encyclopedia)Dalhousie, James Andrew Broun Ramsay, 1st marquess of dălho͞oˈzē, –houˈ– [key], 1812–60, British statesman. After serving as president of the Board of Trade (1845–47) he was governor-gene...

noise

(Encyclopedia)noise, any signal that does not convey useful information. Electrical noise consists of electrical currents or voltages that interfere with the operation of electronic systems. Electrical noise limits...

Mahan, Alfred Thayer

(Encyclopedia)Mahan, Alfred Thayer məhănˈ [key], 1840–1914, U.S. naval officer and historian, b. West Point, N.Y. A Union naval officer in the Civil War, he later lectured on naval history and strategy at the ...

Livingstone, Ken

(Encyclopedia)Livingstone, Ken, 1945–, British politician. Elected to the Greater London Council (GLC) in 1973 as a Labour member, he became GLC leader in 1981. His use of the local office to promote leftist poli...

insomnia

(Encyclopedia)insomnia, abnormal wakefulness or inability to sleep. The condition may result from illness or physical discomfort, or it may be caused by stimulants such as coffee or drugs. However, frequently some ...

anticoagulant

(Encyclopedia)anticoagulant ănˌtēkōăgˈyələnt [key], any of several substances that inhibit blood clot formation (see blood clotting). Some anticoagulants, such as the coumarin derivatives bishydroxycoumarin...

Americans with Disabilities Act

(Encyclopedia)Americans with Disabilities Act, U.S. civil-rights law, enacted 1990, that forbids discrimination of various sorts against persons with physical or mental handicaps. Its primary emphasis is on enablin...

gastric juice

(Encyclopedia)gastric juice, thin, strongly acidic (pH varying from 1 to 3), almost colorless liquid secreted by the glands in the lining of the stomach. Its essential constituents are the digestive enzymes pepsin ...

adrenocorticotropic hormone

(Encyclopedia)adrenocorticotropic hormone ədrēˈnōkôrˌtəkōtrŏpˈĭk [key], polypeptide hormone secreted by the anterior pituitary gland. Its chief function is to stimulate the cortex of the adrenal gland to...