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Mahdi

(Encyclopedia)Mahdi mäˈdē [key] [Arab.,=he who is divinely guided], in Sunni Islam, the restorer of the faith. He will appear at the end of time to restore justice on earth and establish universal Islam. The Mah...

Clark, William

(Encyclopedia)Clark, William, 1770–1838, American explorer, one of the leaders of the Lewis and Clark expedition, b. Caroline co., Va.; brother of George Rogers Clark. He was an army officer (1792–96), serving ...

Billings, John Shaw

(Encyclopedia)Billings, John Shaw, 1838–1913, American surgeon and librarian, b. Indiana. In the Civil War he was medical inspector of the Army of the Potomac. After the war he was given charge of the Surgeon Gen...

acknowledgment

(Encyclopedia)acknowledgment, in law, formal declaration or admission by a person who executed an instrument (e.g., a will or a deed) that the instrument is his. The acknowledgment is made before a court, a notary ...

Monotheletism

(Encyclopedia)Monotheletism or Monothelitism both: mənŏthˈə lĭtĭzˌəm [key] [Gr.,=one will], 7th-century opinion condemned as heretical by the Third Council of Constantinople in 680 (see Constantinople, Thir...

osmosis

(Encyclopedia)osmosis ŏzmōˈsĭs [key], transfer of a liquid solvent through a semipermeable membrane that does not allow dissolved solids (solutes) to pass. Osmosis refers only to transfer of solvent; transfer o...

Northwest Territory

(Encyclopedia)CE5 Northwest Territory Northwest Territory, first possession of the United States, comprising the region known as the Old Northwest, S and W of the Great Lakes, NW of the Ohio River, and E of the...

Shrewsbury, Charles Talbot, duke of

(Encyclopedia)Shrewsbury, Charles Talbot, duke of shrōzˈbərē, shro͞ozˈ– [key], 1660–1718, English statesman. Brought up a Roman Catholic, he embraced Protestantism in 1679. A powerful Whig, he was one of ...

gyroscope

(Encyclopedia)CE5 Three-frame gyroscope gyroscope jīˈrəskōpˌ [key], symmetrical mass, usually a wheel, mounted so that it can spin about an axis in any direction. When spinning, the gyroscope has special p...

tick

(Encyclopedia)tick, small, parasitic arachnid of the order Ixodida, closely related to the mites. Ticks, which are larger than the often microscopic mites, are all parasitic in at least one developmental stage; mos...