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gall, in botany

(Encyclopedia)gall, abnormal growth, or hypertrophy, of plant tissue produced by chemical or mechanical (e.g., the rubbing together of two branches) irritants or hormones. Chemical irritants are released by parasit...

woodcreeper

(Encyclopedia)woodcreeper or woodhewer, common names for woodpeckerlike birds of tropical forest and brush, constituting about 50 species in the family Dendrocolaptidae. Supported by their stiff tails, they cling v...

Sharon, Ariel

(Encyclopedia)Sharon, Ariel ärˈēĕl shärōnˈ [key], 1928–2014, Israeli general and politician, b. Kfar Malal as Ariel Scheinerman. As a teenager he joined the Haganah, the underground Zionist military brigad...

leafhopper

(Encyclopedia)leafhopper, common name for small, wedge-shaped leaping insects, cosmopolitan in distribution, belonging to the family Cicadellidae, which comprises some 5,500 species of insects. Some are brightly co...

Madonna

(Encyclopedia)Madonna (Madonna Louise Ciccone) mədŏnˈə, chĭkōˈnē [key], 1958–, American p...

Veracruz, city, Mexico

(Encyclopedia)Veracruz, city (1990 pop. 303,152), Veracruz state, E central Mexico, on the Gulf of Mexico. Rivaling Tampico as the country's main port, it is also the commercial and industrial center of an importan...

combustion

(Encyclopedia)combustion, rapid chemical reaction of two or more substances with a characteristic liberation of heat and light; it is commonly called burning. The burning of a fuel (e.g., wood, coal, oil, or natura...

Eriugena, John Scotus

(Encyclopedia)Eriugena or Erigena, John Scotus skōˈtəs ĕryo͞oˈjĭnə; ĕrĭjˈ– ĕrēˈ– [key] [Lat. Scotus=Irish, Eriugena=born in Ireland], c.810–c.877, scholastic philosopher, born in Ireland. About ...

Parkinson's disease

(Encyclopedia)Parkinson's disease or Parkinsonism, degenerative brain disorder first described by the English surgeon James Parkinson in 1817. When there is no known cause, the disease usually appears after age 40 ...

Easter

(Encyclopedia)Easter [A.S. Eastre, name of a spring goddess], chief Christian feast, commemorating the resurrection of Jesus after his crucifixion. In the West, Easter is celebrated on the Sunday following the full...