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actinium a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac)
adder's-tongue any of various ferns with a single sporeless leaflike frond and a slender spore-bearing spike or stalk that suggests a snake's tongue. [1/2 definitions]
admiral any of a family of brightly colored, medium to large-sized butterflies, found worldwide. [1/2 definitions]
agape1 opened completely; wide-open. [1/4 definitions]
ageism discrimination on the basis of age, esp. against the elderly or middle-aged.
agribusiness large-scale industrial agriculture and related activities such as food-processing, equipment manufacture, and marketing.
ai2 a large three-toed sloth of Central and South America, whose coat has a greenish tinge from the algae that live in it.
alabaster a dense, fine-grained gypsum, often white and translucent, that is often carved for ornaments and figurines. [1/5 definitions]
alexandrine (sometimes cap.) in poetry, a twelve-syllable line with alternating unstressed and stressed syllables, usu. with a clear pause after six syllables. [1/2 definitions]
Alex Haley a U.S. author celebrated for his pulitzer prize-winning work of historical fiction, Roots: The Saga of an American Family (1976), a publication whose subsequent television broadcast adaptation spawned a national discussion about race and race relations (b.1921--d.1992).
altimeter an altitude-measuring device such as a specially calibrated barometer.
amanita any of various, mostly poisonous mushrooms having blade-shaped gills on the underside.
amaryllis any of a group of bulbous plants bearing a lilylike rose-colored blossom.
ammonium carbonate a white powder that is used in baking powder, smelling salts, and substances for fire-extinguishing.
amoeba a one-celled organism that changes its shape as it moves and engulfs food.
anabasis any large-scale military expedition or march, esp. one from a coast to the interior.
anise a plant with small clusters of flowers and licorice-flavored seeds. [1/2 definitions]
antibiotic any of various substances derived from fungi or other organisms and used to destroy or prevent the growth of bacteria or other disease-causing organisms. [1/2 definitions]
ant lion any of several lace-winged insects whose larvae dig holes in which they trap ants or other insects for food.
ao dai (Vietnamese) the costume traditionally worn by women in Vietnam, having loose-fitting trousers and a long tunic.
apricot a soft round fruit with fuzzy orange-pink or yellow skin. [1/3 definitions]