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spire

(Encyclopedia)spire, high, tapering structure crowning a tower and having a general pyramidal outline. The simplest spires were the steeply pitched timber roofs capping Romanesque towers and campaniles. In later Ro...

formula, in chemistry

(Encyclopedia)formula, in chemistry, an expression showing the chemical composition of a compound. Formulas of compounds are used in writing the equations (see chemical equations) that represent chemical reactions....

conic section

(Encyclopedia)CE5 Conic sections conic section or conic kŏnˈĭk [key], curve formed by the intersection of a plane and a right circular cone (conical surface). The ordinary conic sections are the circle, the ...

aorta

(Encyclopedia)CE5 Aorta aorta āôrˈtə [key], primary artery of the circulatory system in mammals, delivering oxygenated blood to all other arteries except those of the lungs. The human aorta, c.1 in. (2.54 c...

hand

(Encyclopedia)CE5 Bones of right wrist and hand, dorsal view hand, terminal part of the forelimb in primates. The human hand consists of the wrist, palm, four fingers, and thumb. In humans and other primates, t...

furfural

(Encyclopedia)CE5 furfural fûrˌfərălˈdəhīd [key] [Lat.,=bran], C4H3OCHO, viscous, colorless liquid that has a pleasant aromatic odor; upon exposure to air it turns dark brown or black. It boils at about 1...

gall bladder

(Encyclopedia)CE5 Gall bladder gall bladder, small pear-shaped sac that stores and concentrates bile. It is connected to the liver (which produces the bile) by the hepatic duct. When food containing fat reaches...

apparition

(Encyclopedia)apparition, spiritualistic manifestation of a person or object in which a form not actually present is seen with such intensity that belief in its reality is created. The ancient and widespread belief...

astronomical coordinate systems

(Encyclopedia)astronomical coordinate systems. A coordinate system is a method of indicating positions. Each coordinate is a quantity measured from some starting point along some line or curve, called a coordinate ...

aschelminths

(Encyclopedia)CE5 Internal anatomy of a female rotifer, representative of the phylum Aschelminthes aschelminths ăsk-hĕlmĭnˈthz [key], large assemblage of loosely related, wormlike organisms of extremely var...