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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....

linden, in botany

(Encyclopedia)CE5 Linden, Tilia americana linden, common name for the Tiliaceae, a family of chiefly woody shrubs and trees. Most genera are tropical, but the genus Tilia, commonly called linden, or lime tree, ...

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...

lute

(Encyclopedia)CE5 Lute lute, musical instrument that has a half-pear-shaped body, a fretted neck, and a variable number of strings, which are plucked with the fingers. The long lute, with its neck much longer t...

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...

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...