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Crab Nebula

(Encyclopedia)Crab Nebula, diffuse gaseous nebula in the constellation Taurus; cataloged as NGC 1952 and M1, the first object recorded in Charles Messier's catalog of nonstellar objects (see Messier catalog). It is...

decompression sickness

(Encyclopedia)decompression sickness, physiological disorder caused by a rapid decrease in atmospheric pressure, resulting in the release of nitrogen bubbles into the body tissues. It is also known as caisson disea...

Chuvash Republic

(Encyclopedia)Chuvash Republic cho͞oväshˈ [key] or Chuvashia, constituent republic, 7,066 sq mi (18,301 ...

hydrogen cyanide

(Encyclopedia)hydrogen cyanide, HCN, colorless, volatile, and extremely poisonous chemical compound whose vapors have a bitter almond odor. It melts at −14℃ and boils at 26℃. It is miscible in all proportions...

hydrazine

(Encyclopedia)hydrazine hīˈdrəzēnˌ [key], chemical compound, formula NH2NH2, m.p. 1.4℃, b.p. 113.5℃, specific gravity 1.011 at 15℃. It is very soluble in water and soluble in alcohol. At ordinary tempera...

Freeport, cities, United States

(Encyclopedia)Freeport. 1 City (2020 pop. 23,973), seat of Stephenson co., NW Ill., on the Pecatonica River; inc. 1850. It is a trade and manufacturing center in a ...

Abilene

(Encyclopedia)Abilene ăbˈĭlēn [key]. 1 City (2020 pop. 6,460), seat of Dickinson co., central Kans., on the Smoky Hill River; inc. 1869. It was (1867–71) a railhead for a large ca...

Garden City, cities, United States

(Encyclopedia)Garden City. 1 City (2020 pop. 10,289), Chatham co., SE Ga., a port of entry, distribution center, and industrial city on the Savannah River; inc. ...

atropine

(Encyclopedia)atropine ătˈrəpēn, –pĭn [key], alkaloid drug derived from belladonna and other plants of the family Solanaceae (nightshade family). Available either as the tincture or extract of belladonna, or...

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