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natural childbirth

(Encyclopedia)natural childbirth: see birth.

(Encyclopedia)Rank, Otto ôtˈō rängk [key], 1884–1937, Austrian psychoanalyst; one of Sigmund Freud's first and most valued pupils. He early employed Freudian techniques to clarify the underlying significance ...

Betzig, Robert Eric

(Encyclopedia)Betzig, Robert Eric, 1960–, American physicist, b. Ann Arbor, Mich., Ph.D. Cornell, 1988. Betzig worked at AT&T Bell Laboratories from 1988 to 1996, when he become vice president of research and...

Gabrieli, Andrea

(Encyclopedia)Gabrieli, Andrea jōvänˈnē [key], c.1555–1612. Giovanni was for a time a singer in the court choir under Lasso in Munich and became (1585) second organist at St. Mark's, succeeding to first organ...

Stopes, Marie Carmichael

(Encyclopedia)Stopes, Marie Carmichael stōps [key], 1880–1958, British paleobotanist and eugenicist, b. Edinburgh, D.Sc. Univ. of London, Ph.D. Univ. of Munich. She lectured on paleobotany at the universities of...

Cruveilhier, Jean

(Encyclopedia)Cruveilhier, Jean zhäN krüvĕyāˈ [key], 1791–1874, French physician. The first professor of pathology at the Univ. of Paris (from 1836), he introduced the descriptive method into the study of th...

hertz

(Encyclopedia)hertz hûrts [key] [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz...

stereopticon

(Encyclopedia)stereopticon stĕrēŏpˈtĭkən [key], optical projection instrument making multiple use of the magic lantern. The magic lantern uses lenses to throw on a screen a magnified image from a transparent ...

birthmark

(Encyclopedia)birthmark, pigmented maldevelopment of the skin that varies in size, either present at birth or developing later. Birthmarks may appear as moles (melanocytic nevi) that vary in color from light brown ...