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Rockefeller Foundation
(Encyclopedia)Rockefeller Foundation, philanthropic institution established (1913) by John D. Rockefeller, Sr., to promote “the well-being of mankind throughout the world.” During its first 14 years the foundat...pigment
(Encyclopedia)pigment, substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface. The pigments used i...Zika virus
(Encyclopedia)Zika virus zēˈkə [key], single-stranded RNA virus of the genus flavivirus that infects human and primates and causes a disease known as Zika fever or zika. It is primarily transmitted by the bite o...hay fever
(Encyclopedia)hay fever, seasonal allergy causing inflammation of the mucous membranes of the nose and eyes. It is characterized by itching about the eyes and nose, sneezing, a profuse watery nasal discharge, and t...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...rickettsia
(Encyclopedia)rickettsia rĭkĕtˈsēə [key], any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods s...Ayllón, Lucas Vásquez de
(Encyclopedia)Ayllón, Lucas Vásquez de lo͞oˈkäs väsˈkāth dā īlyōnˈ [key], c.1475–1526, Spanish explorer. He emigrated in 1502 to Santo Domingo, where he became a public official. In 1521, Francisco Go...Crimean-Congo hemorrhagic fever
(Encyclopedia)Crimean-Congo hemorrhagic fever, acute, sometimes fatal disease endemic in many parts of Eurasia and Africa, caused by a tick-borne virus. The virus, an RNA virus (Nairovirus) of the Bunyaviridae fami...aspirin
(Encyclopedia)aspirin, acetyl derivative of salicylic acid (see salicylate) that is used to lower fever, relieve pain, reduce inflammation, and thin the blood. Common conditions treated with aspirin include headach...Galveston
(Encyclopedia)Galveston gălˈvəstən [key], city (2020 pop. 50,546), seat of Galveston co., on Galveston ...Browse by Subject
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