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momentum

(Encyclopedia)momentum mōmĕnˈtəm [key], in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magn...

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...

nephron

(Encyclopedia)nephron: see urinary system.

nerve

(Encyclopedia)nerve: see nervous system.

reflex

(Encyclopedia)reflex: see nervous system.

villi

(Encyclopedia)villi: see digestive system.

epicycle

(Encyclopedia)epicycle: see Ptolemaic system.

vagina

(Encyclopedia)vagina: see reproductive system. ...

ganglion

(Encyclopedia)ganglion: see nervous system.