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labor, in economics
(Encyclopedia)labor, term used both for the effort of performing a task and for the workers engaged in the activity. In ancient times much of the work was done by slaves (see slavery). In the feudal period agricult...key, in mechanics
(Encyclopedia)key, in mechanics: see lock and key. ...key, in music
(Encyclopedia)key. 1 In music, term used to indicate the scale from which the tonal material of a given composition is derived. To say, for example, that a composition is in the key of C major means that it uses as...Arethusa, in botany
(Encyclopedia)Arethusa: see orchid.argonaut, in zoology
(Encyclopedia)argonaut, in zoology: see paper nautilus. ...kea, in zoology
(Encyclopedia)kea: see parrot.arc, in electricity
(Encyclopedia)arc, in electricity, highly luminous and intensely hot discharge of electricity between two electrodes. The arc was discovered early in the 19th cent. by the English scientist Sir Humphry Davy, who so...arc, in geometry
(Encyclopedia)arc, in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central angle of θ radian...kite, in zoology
(Encyclopedia)kite, in zoology, common name for a bird of the family Accipitridae, which also includes the hawk. Kites are found near water and marshes in warm parts of the world. They prey chiefly on reptiles, fro...abacus, in architecture
(Encyclopedia)abacus ăbˈəkəs [key], in architecture, flat slab forming the top member of a capital. In classical orders it varies from a square form having unmolded sides in the Greek Doric, to thinner proporti...Browse by Subject
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