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R
R 18th letter of the alphabet , corresponding to Greek rho. When in Latin alphabets the letters for p and r became similar in appearance, the rho form (P; which at first was used for the r sound) was restricted to the p sound, and an extra line was added for the r sound (R). In Greek, wh...
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J. R. R. Tolkien
J. R. R. Tolkien (John Ronald Reuel Tolkien) , 1892-1973, British novelist, b. South Africa. A fantasy writer and Oxford don, Tolkien wrote The Hobbit (1937), adapted from stories he told his children. Some of the characters from The Hobbit reappear in The Lord of the Rings (1954-55), a tril...
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ketone
ketone , any of a class of organic compounds that contain the carbonyl group , C[symbol]O, and in which the carbonyl group is bonded only to carbon atoms. The general formula for a ketone is RCOR′, where R and R′ are alkyl or aryl groups. The simplest ketone, where R and R′ are me...
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Formulas for Various Areas
Formulas for Various Areas
Formulas for Various Areas
The abbreviations used are: b = base (length of any side of a plane figure); a = altitude (perpendicular distance from the farthest point of the figure to the extended base); s = side; ...
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Mátyás Rákosi
Mátyás Rákosi , 1892-1971, Hungarian Communist politician. An associate of Bela Kun and later a disciple of Joseph Stalin , Rákosi was one of the chief engineers of post-World War II Communist Hungary. He became premier in 1952, but was removed in 1953 as a Stalinist. ...
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formula
formula in mathematics and physics, equation expressing a definite fixed relationship between certain quantities. The quantities are usually expressed by letters, and their relationship is indicated by algebraic symbols. For example, A =π r2 is the formula for the area A of a circle of rad...
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Gjirokastër
Gjirokastër or Gjinokastër , Gr. Argyrokastron, It. Argirocastro, town (1989 pop. 24,207), capital of Gjirokastër dist., S Albania. A commercial center, it produces foodstuffs, leather, and textiles. There are several 18th-century mosques and churches and an old citadel (rebui...
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Bram Stoker
Bram Stoker (Abraham Stoker), 1847-1912, English novelist, b. Ireland. He is best remembered as the author of Dracula (1897), a horror story recounting the adventures of the vampire Count Dracula. The fame of the leading character was furthered by popular stage and film adaptations of the novel. ...
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factor
factor in arithmetic, any number that divides a given number evenly, i.e., without any remainder. The factors of 12 are 1, 2, 3, 4, 6, and 12. Similarly in algebra, any one of the algebraic expressions multiplied by another to form a product is a factor of that product, e.g., a + b and a - b ar...
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A. R. Ammons
A. R. Ammons (Archie Randolph Ammons), 1926-2001, American poet, b. Whiteville, N.C., grad. Wake Forest College (1949). He began writing poetry while serving in the Navy during World War II, and, after working as a school principal and sales executive, he taught creative writing (1964-71) at Cornel...
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