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topaz

(Encyclopedia)topaz tōˈpăz [key], aluminum silicate mineral with either hydroxyl radicals or fluorine, Al2SiO4(F,OH)2, used as a gem. It is commonly colorless or some shade of pale yellow to wine-yellow; pale bl...

tourmaline

(Encyclopedia)tourmaline to͝orˈməlĭn, –lēn [key], complex borosilicate mineral with varying amounts of aluminum, iron, magnesium, sodium, lithium, potassium, and sometimes other elements, used as a gem. It o...

pineapple

(Encyclopedia)pineapple, common name for one member of and for the Bromeliaceae, a family of chiefly epiphytic herbs and small shrubs native to the American tropics and subtropics. The spiny leaves of various speci...

Portuguese language

(Encyclopedia)CEE Portuguese language, member of the Romance group of the Italic subfamily of the Indo-European family of languages (see Romance languages). It is the mother tongue of about 170 million people, c...

Paraguay, country, South America

(Encyclopedia)CE5 Paraguay pârˈəgwā, –gwī, Span. pärägwīˈ [key], officially Republic of Paraguay, republic (2015 est. pop. 6,639,000), 157,047 sq mi (406,752 sq km), S central South America. Paraguay ...

Dorrego, Manuel

(Encyclopedia)Dorrego, Manuel mänwĕlˈ dôr-rāˈgō [key], 1787–1828, Argentine statesman and soldier, governor of Buenos Aires province (1820, 1827–28). After serving for a time in the War of Independence, ...

graphite

(Encyclopedia)graphite grăfˈīt [key], an allotropic form of carbon, known also as plumbago and black lead. It is dark gray or black, crystalline (often in the form of slippery scales), greasy, and soft, with a m...

Medawar, Sir Peter Brian

(Encyclopedia)Medawar, Sir Peter Brian mĕdˈəwär [key], 1915–87, British zoologist, b. Brazil. After graduate work at Oxford, he held research and teaching posts there. He was professor of zoology (1947–51) ...

Lavalle, Juan

(Encyclopedia)Lavalle, Juan hwän läväˈyā [key], 1797–1841, Argentine general, governor of Buenos Aires province (1828–29). He served (1816–24) in the War of Independence and (1826–28) in the war with B...

Koprowski, Hilary

(Encyclopedia)Koprowski, Hilary, 1916–2013, Polish-American microbiologist and immunologist, b. Warsaw, M.D. Univ. of Warsaw, 1939. He fled Poland after the Nazi invasion (1939), making his way to Brazil where he...