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tractor
(Encyclopedia)tractor, in agriculture, vehicle used to pull such equipment as plows, cultivators, and mowers; to power stationary devices such as saws and winches; and to push snowplows and earth-moving implements....HIV
(Encyclopedia)HIV, human immunodeficiency virus, either of two closely related retroviruses that invade T-helper lymphocytes and are responsible for AIDS. There are two types of HIV: HIV-1 and HIV-2. HIV-1 is respo...divination
(Encyclopedia)divination, practice of foreseeing future events or obtaining secret knowledge through communication with divine sources and through omens, oracles, signs, and portents. It is based on the belief in r...Tokarczuk, Olga
(Encyclopedia)Tokarczuk, Olga, 1962–, Polish writer. Widely considered the foremost Polish novelist of her generation, she also is politically active and has been a frequent critic of Poland's right-wing governme...Hamilton, Sir William Rowan
(Encyclopedia)Hamilton, Sir William Rowan, 1805–65, Irish mathematician and astronomer, b. Dublin. A child prodigy, he had mastered 13 languages by the age of 13 and was still an undergraduate when he became prof...Sallust
(Encyclopedia)Sallust (Caius Sallustius Crispus) sălˈəst [key], 86 b.c.–c.34 b.c., Roman historian. He was tribune of the people (52 b.c.) and praetor (46). He was ejected (50) from the senate ostensibly for a...Huxley, Sir Andrew Fielding
(Encyclopedia)Huxley, Sir Andrew Fielding, 1917–2012, British physiologist, educated at University College, London; grandson of Thomas Henry Huxley, half-brother of Sir Julian Huxley and Aldous Huxley. He finishe...annual
(Encyclopedia)annual, plant that germinates from seed, blossoms, produces seed, and dies within one year. Annuals propagate themselves by seed only, unlike many biennials and perennials. They are thus especially su...species
(Encyclopedia)species, in biology, a category of classification, the original and still the basic unit in the demarcation of plant and animal types. The species marks the boundary between populations of organisms r...globulin
(Encyclopedia)globulin, any of a large family of proteins of a spherical or globular shape that are widely distributed throughout the plant and animal kingdoms. Many of them have been prepared in pure crystalline f...Browse by Subject
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