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extinction

(Encyclopedia)extinction, in biology, disappearance of species of living organisms. Extinction usually occurs as a result of changed conditions to which the species is not suited. If no member of the affected speci...

Rao, Raja

(Encyclopedia)Rao, Raja rou [key], 1909–2006, Indian novelist, b. Hassan, Mysore (now Karnataka), as Raja. Rao took his surname as an adult, and was educated in India and France and for many years divided his ti...

Simic, Charles

(Encyclopedia)Simic, Charles sĭmˈĭc [key], 1938–2023, American poet, b. Belgrade, Yugoslavia (now in S...

dwarf planet

(Encyclopedia)dwarf planet, a nonluminous body of rock or gas that orbits the sun and has a rounded shape due to its gravity. Unlike a planet, a dwarf planet is not capable of clearing its orbit of smaller objects ...

eukaryote

(Encyclopedia)eukaryote yo͞okârˈē-ōtˌ [key], a cell or organism composed of cells that have a membrane-bound nucleus and organelles (mitochondria, chloroplasts; see cell, in biology) and genetic material orga...

adolescence

(Encyclopedia)adolescence, time of life from onset of puberty to full adulthood. The exact period of adolescence, which varies from person to person, falls approximately between the ages 12 and 20 and encompasses b...

Henze, Hans Werner

(Encyclopedia)Henze, Hans Werner häns vĕrˈnər hĕnˈtsə [key], 1926–2012, German composer, b. Gütersloh. Henze was a pupil of Wolfgang Fortner and René Leibowitz. His early works were influenced by Stravin...

Lavoisier, Antoine Laurent

(Encyclopedia)Lavoisier, Antoine Laurent äNtwänˈ lōräNˈ lävwäzyāˈ [key], 1743–94, French chemist and physicist, a founder of modern chemistry. He studied under eminent men of his day, won early recognit...

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...