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dune

(Encyclopedia)dune, mound or ridge of wind-blown sand formed in arid regions and along coasts. Dunes are common in most of the great deserts of the world. Often a dune begins to form because material is deposited b...

Colorado River storage project

(Encyclopedia)Colorado River storage project, a multipurpose plan, undertaken by the U.S. Bureau of Reclamation in 1956, to control the flow of the upper Colorado and its tributaries and to aid in the development o...

McCain, John Sidney, 3d

(Encyclopedia)McCain, John Sidney, 3d, 1936–2018, U.S. politician, b. Panama Canal Zone. A much decorated navy veteran, he was born into a career naval family and a...

lemon

(Encyclopedia)lemon, one of the citrus fruits, from a tree (Citrus limon) of the family Rutaceae (orange family), probably native to India. A small tree (to about 15 ft/5 m tall) with thorny branches and purple-edg...

sorghum

(Encyclopedia)sorghum, tall, coarse annual (Sorghum bicolor) of the family Poaceae (grass family), somewhat similar in appearance to corn (but having the grain in a panicle rather than an ear) and used for much the...

Sonora

(Encyclopedia)Sonora sōnōˈrä [key], state (1990 pop. 1,823,606), 70,484 sq mi (182,554 sq km), NW Mexico, on the Gulf of California, S of Arizona. Hermosillo is the capital. Sonora is mostly mountainous, with v...

dialect

(Encyclopedia)dialect, variety of a language used by a group of speakers within a particular speech community. Every individual speaks a variety of his language, termed an idiolect. Dialects are groups of idiolects...

Epirus

(Encyclopedia)Epirus ĕpīˈrəs [key], ancient country of Greece, on the Ionian Sea and W of Macedon and Thessaly, a region now occupied by NW Greece and S Albania. At the time of Homer, Epirus was known as the ho...

daylight saving time

(Encyclopedia)daylight saving time (DST), time observed when clocks and other timepieces are set ahead so that the sun will rise and set later in the day as measured by civil time. The amount of daylight on a given...

marble

(Encyclopedia)marble, metamorphic rock composed wholly or in large part of calcite or dolomite crystals, the crystalline texture being the result of metamorphism of limestone by heat and pressure. The term marble i...