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Lorentz contraction

(Encyclopedia)Lorentz contraction lôrˈĕnts [key], in physics, contraction or foreshortening of a moving body in the direction of its motion, proposed by H. A. Lorentz on theoretical grounds and based on an earli...

Murchison, Sir Roderick Impey

(Encyclopedia)Murchison, Sir Roderick Impey mûrˈkĭsən [key], 1792–1871, British geologist. He served in the Napoleonic Wars but after the peace turned his attention to science. In the 1830s he undertook the i...

barcode

(Encyclopedia)CE5 Barcode barcode, computer coding system that uses a printed pattern of lines and bars to identify such things as products, mail and packages, and customer accounts; the term also is used for s...

kidneys

(Encyclopedia)kidneys: see urinary system.

ganglion

(Encyclopedia)ganglion: see nervous system.

epicycle

(Encyclopedia)epicycle: see Ptolemaic system.

penis

(Encyclopedia)penis: see reproductive system.

reflex

(Encyclopedia)reflex: see nervous system.

peristalsis

(Encyclopedia)peristalsis: see digestive system. ...

nephron

(Encyclopedia)nephron: see urinary system.