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Dravidian languages

(Encyclopedia)Dravidian languages drəvĭdˈēən [key], family of about 23 languages that appears to be unrelated to any other known language family. The Dravidian languages are spoken by more than 200 million peo...

Cuvier, Georges Léopold Chrétien Frédéric Dagobert, Baron

(Encyclopedia)Cuvier, Georges Léopold Chrétien Frédéric Dagobert, Baron zhôrzh lāôpôldˈ krātyăNˈ frādārēkˈ dägôbĕrˈ bärôNˈ küvyāˈ [key], 1769–1832, French naturalist, b. Montbéliard, st...

extroversion and introversion

(Encyclopedia)extroversion and introversion, terms introduced into psychology by Carl Jung to identify opposite psychological types. Jung saw the activity of the extrovert directed toward the external world and tha...

Siebold

(Encyclopedia)Siebold tāˈōdōr ĕrnst [key], 1804–85, also a physician, was one of the foremost biologists of his time. He specialized in the comparative anatomy of invertebrates and wrote the first volume (18...

radio frequency

(Encyclopedia)radio frequency, range of electromagnetic waves with a frequency or wavelength suitable for communication uses. Some of these waves serve as carriers of the lower-frequency audio waves; others are mod...

zone

(Encyclopedia)zone [Gr.,=girdle], in geography, area with a certain physical and/or cultural unity that distinguishes it from other areas. The division of the earth into five climatic zones probably originated (5th...

mental retardation

(Encyclopedia)mental retardation, below average level of intellectual functioning, usually defined by an IQ of below 70 to 75, combined with limitations in the skills necessary for daily living. Daily living skills...

grammar

(Encyclopedia)grammar, description of the structure of a language, consisting of the sounds (see phonology); the meaningful combinations of these sounds into words or parts of words, called morphemes; and the arran...

voice, sound produced by living beings

(Encyclopedia)voice, sound produced by living beings. The source of the sound in human speaking and singing is the vibration of the vocal cords, which are inside the larynx, and the production of the sounds is call...

gum, colloidal plant substance

(Encyclopedia)gum, term commonly applied to any of a wide variety of colloidal substances somewhat similar in appearance and general characteristics, exuded by or extracted from plants. In this classification, howe...