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Roach, Hal
(Encyclopedia) Roach, Hal (Harold Eugene Roach, Sr.), 1892–1992, American move producer and director, b. Elmira, N.Y. He entered (1912) the motion-picture industry as an extra, and by 1914 had…Rollo
(Encyclopedia) RolloRollorŏlˈō [key] or HrolfRollorŏlf [key], c.860–c.932, first duke of Normandy. As leader of the Norman pirates settled at the mouth of the Seine, he attacked (910) Paris and…proverb
(Encyclopedia) proverb, short statement of wisdom or advice that has passed into general use. More homely than aphorisms, proverbs generally refer to common experience and are often expressed in…psychrometer
(Encyclopedia) psychrometerpsychrometersīkrŏmˈĭtər [key], one of many instruments used for measuring the water vapor content or relative humidity of the atmosphere. It consists of two identical…ohmmeter
(Encyclopedia) ohmmeterohmmeterōmˈmēˌtər [key], instrument used to measure the electrical resistance of a conductor. It is usually included in a single package with a voltmeter, and often an ammeter…epinephrine
(Encyclopedia) epinephrineepinephrineĕpˌənĕfˈrīn [key], hormone important to the body's metabolism, also known as adrenaline. Epinephrine, a catecholamine, together with norepinephrine, is secreted…conjunctivitis
(Encyclopedia) conjunctivitisconjunctivitiskənjəngtəvīˈtəs [key], inflammation or infection of the mucosal membrane that covers the eyeball and lines the eyelid, usually acute, caused by a virus or,…Compton effect
(Encyclopedia) Compton effect [for A. H. Compton], increase in the wavelengths of X rays and gamma rays when they collide with and are scattered from loosely bound electrons in matter. This effect…anaphylaxis
(Encyclopedia) anaphylaxisanaphylaxisănˌəfəlăkˈsĭs [key], hypersensitive state that may develop after introduction of a foreign protein or other antigen into the body tissues. When an anaphylactic…Becker, Carl Lotus
(Encyclopedia) Becker, Carl Lotus, 1873–1945, American historian, b. Blackhawk co., Iowa. He taught history at Dartmouth College (1901–2), at the Univ. of Kansas (1902–16), and at Cornell (1917–41).…Trending
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