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Norman Conquest

(Encyclopedia)Norman Conquest, period in English history following the defeat (1066) of King Harold of England by William, duke of Normandy, who became William I of England. The conquest was formerly thought to hav...

Neolithic period

(Encyclopedia)Neolithic period or New Stone Age. The term neolithic is used, especially in archaeology and anthropology, to designate a stage of cultural evolution or technological development characterized by the ...

Kiowa

(Encyclopedia)Kiowa kīˈəwə [key], Native North Americans whose language is thought to form a branch of the Aztec-Tanoan linguistic stock (see Native American languages). The Kiowa, a nomadic people of the Plain...

Kandinsky, Wassily

(Encyclopedia)Kandinsky, Wassily or Vasily kăndĭnˈskē, Rus. vəsēˈlyē kəndyēnˈskē [key], 1866–1944, Russian abstract painter and theorist. Usually regarded as the originator of abstract art, Kandinsky ...

strontium

(Encyclopedia)strontium strŏnˈshēəm [key] [from Strontian, a Scottish town], a metallic chemical element; symbol Sr; at. no. 38; at. wt. 87.62; m.p. 769℃; b.p. 1,384℃; sp. gr. 2.6 at 20℃; valence +2. Stro...

light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...

distillation

(Encyclopedia)distillation, process used to separate the substances composing a mixture. It involves a change of state, as of liquid to gas, and subsequent condensation. The process was probably first used in the p...

chlorate

(Encyclopedia)chlorate pərklōrˈāt, –klôrˈ– [key], salts of chloric acid, HClO3, and perchloric acid, HClO4, respectively. Perchlorates are safer to handle than chlorates; they are more stable when expos...

infection

(Encyclopedia)infection, invasion of plant or animal tissues by microorganisms, i.e., bacteria, viruses, viroids, fungi, rickettsias, and protozoans. The invasion of body tissues by parasitic worms and other higher...

hemorrhagic fever

(Encyclopedia)hemorrhagic fever hĕmˌərăjˈĭk [key], any of a group of viral diseases characterized by sudden onset, muscle and joint pain, fever, bleeding, and shock from loss of blood. Bleeding occurs in the ...