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nitro group

(Encyclopedia)nitro group, in chemistry, functional group that consists of a nitrogen atom joined to two oxygen atoms. Compounds that contain a nitro group, e.g., picric acid and trinitrotoluene (TNT), are called n...

Wöhler, Friedrich

(Encyclopedia)Wöhler, Friedrich frēˈdrĭkh vöˈlər [key], 1800–1882, German chemist. He studied under the German chemist Leopold Gmelin and J. J. Berzelius, a Swedish chemist, and in 1836 was appointed profe...

bayberry

(Encyclopedia)bayberry, common name for the Myricaceae, a family of trees and shrubs with aromatic foliage, found chiefly in temperate and subtropical regions. The waxy gray “berries” of the North American wild...

stearin

(Encyclopedia)stearin stērˈĭn [key], fat that is the triglyceride of stearic acid, CH3(CH2)16CO2H, i.e., the tristearate ester of glycerol. It is a white crystalline solid at ordinary temperatures and is insolub...

liturgy, Islamic

(Encyclopedia)liturgy, Islamic, mandatory ritual prayer in Islam (salat) is performed five times a day at dawn, noon, afternoon, sunset, and night. It requires ritual cleanliness, and is preceded by ablutions. The ...

Kurokawa, Kisho Noriaki

(Encyclopedia)Kurokawa, Kisho Noriaki nôrēäˈkē kēˈshō ko͞orōˈkäwä [key], 1934–2007, Japanese architect, grad. Tokyo Univ. (Ph.D., 1964). The youngest founding member of the group of architects known ...

Masekela, Hugh

(Encyclopedia)Masekela, Hugh măsˌəkĕlˈə [key], 1939–2018, South African singer, composer, band leader, and trumpet player. After working with several South African jazz bands, he and his then-wife Miriam Ma...

fog

(Encyclopedia)fog, aggregation of water droplets or ice crystals immediately above the surface of the earth (i.e., a cloud near the ground). A light or thin fog is usually called a mist. Fog may occur when the mois...

evaporimeter

(Encyclopedia)evaporimeter ĭvăpˌərĭmˈətər [key], instrument that measures the rate of evaporation of water into the atmosphere, sometimes called an atmometer. Evaporimeters are of two types, those that meas...

quetzal

(Encyclopedia)quetzal kāsälˈ [key], common name for a magnificent bird of the family Trogonidae (trogon family), found in the rain forests from S Mexico to Costa Rica at altitudes of up to 9,000 ft (2,745 m). It...