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niobium

(Encyclopedia) niobiumniobiumnīōˈbēəm [key], metallic chemical element; symbol Nb; at. no. 41; at. wt. 92.90638; m.p. about 2,468℃; b.p. 4,742℃; sp. gr. 8.57 at 20℃; valence +2, +3, +4, or +5.…

mica

(Encyclopedia) micamicamīˈkə [key], general term for a large group of minerals, hydrous silicates of aluminum and potassium, often containing magnesium, ferrous iron, ferric iron, sodium, and lithium…

Martí, José

(Encyclopedia) Martí, JoséMartí, Joséhōsāˈ märtēˈ [key], 1853–95, Cuban essayist, poet, and patriot, leader of the Cuban struggle for independence. One of the greatest prose writers of Spanish…

sandgrouse

(Encyclopedia) sandgrouse, common name for pigeon-sized, seed-eating, terrestrial birds of the genera Pteroclida (approximately 14 species) and Syrrhaptes (2 species). They are birds of the Old World…

Schwarzenegger, Arnold Alois

(Encyclopedia) Schwarzenegger, Arnold Alois, 1947–, Austrian-American actor, bodybuilder, and politician, b. Thal, Austria. He began competing in bodybuilding contests in his teens, and won his first…

Corot, Jean-Baptiste Camille

(Encyclopedia) Corot, Jean-Baptiste CamilleCorot, Jean-Baptiste CamillezhäN-bätēstˈ kämēˈyə kôrōˈ [key], 1796–1875, French landscape painter, b. Paris. Corot was one of the most influential of 19th-…

chameleon

(Encyclopedia) chameleonchameleonkəmēˈlēən, –mēlˈyən [key], small- to medium-sized lizard of the family Chamaeleonidae. More than 150 species are found in sub-Saharan Africa, with a few in S Europe…

diphtheria

(Encyclopedia) diphtheriadiphtheriadĭfthērˈēə [key], acute contagious disease caused by Corynebacterium diphtheriae (Klebs-Loffler bacillus) bacteria that have been infected by a bacteriophage. It…