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John VIII, pope

(Encyclopedia)John VIII, d. 882, pope (872–82), a Roman; successor of Adrian II. John strenuously opposed the activities of St. Ignatius of Constantinople in Bulgaria. When Ignatius died, John recognized Photius ...

Dennett, Tyler

(Encyclopedia)Dennett, Tyler dĕnˈĭt [key], 1883–1949, American historian and educator, b. Spencer, Wis. Dennett was lecturer in American history at Johns Hopkins (1923–24) and at Columbia (1927–28), chief ...

Agnes, Saint

(Encyclopedia)Agnes, Saint, 4th cent., virgin martyr. A noble Roman girl martyred at the age of 13 after rejecting a well-born suitor. She was included in the Depositio Martyrum of 354. On her feast day lambs are b...

Donne, John

(Encyclopedia)Donne, John dŭn, dŏn [key], 1572–1631, English poet and divine. He is considered the greatest of the metaphysical poets. All of Donne's verse—his love sonnets and his religious and philosophic...

Burnham, Daniel Hudson

(Encyclopedia)Burnham, Daniel Hudson bûrˈnəm [key], 1846–1912, American architect and city planner b. Henderson, N.Y. He was trained in architects' offices in Chicago. In that city he established (1873) a part...

salsify

(Encyclopedia)salsify, common name for a tall, narrow-leaved biennial (Tragopogon porrifolius) of the family Asteraceae (aster family), native to S Europe but now naturalized and sometimes growing as a weed in Nort...

radical, in mathematics

(Encyclopedia)radical, in mathematics, symbol () placed over a number or expression, called the radicand, to indicate a root of the radicand. When used without a sign or index number, as in 4, it designates the pos...

St. John, John Pierce

(Encyclopedia)St. John, John Pierce, 1833–1916, American political reformer, b. Brookville, Ind. He traveled in the West and in South America, fought in the Union army in the Civil War, and after 1869 practiced l...

Knox, Philander Chase

(Encyclopedia)Knox, Philander Chase fəlănˈdər [key], 1853–1921, U.S. cabinet member, b. Brownsville, Pa. He built up a fortune as a corporation lawyer in Pittsburgh. He was Attorney General (1901–4) in the ...

mean

(Encyclopedia)mean, in statistics, a type of average. The arithmetic mean of a group of numbers is found by dividing their sum by the number of members in the group; e.g., the sum of the seven numbers 4, 5, 6, 9, 1...