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Janus, in astronomy

(Encyclopedia) JanusJanusjāˈnəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn X (or S10), Janus is an irregularly shaped (nonspherical) body…

impressionism, in music

(Encyclopedia) impressionism, in music, a French movement in the late 19th and early 20th cent. It was begun by Debussy in reaction to the dramatic and dynamic emotionalism of romantic music,…

impressionism, in painting

(Encyclopedia) impressionism, in painting, late-19th-century French school that was generally characterized by the attempt to depict transitory visual impressions, often painted directly from nature…

index, in publishing

(Encyclopedia) index, of a book or periodical, a list, nearly always alphabetical, of the topics treated. This list is usually at the back of a book, and the table of contents is in the front. The…

in vitro fertilization

(Encyclopedia) in vitro fertilizationin vitro fertilizationvēˈtrō, vĭˈtrō [key] (IVF), technique for conception of a human embryo outside the mother's body. Several ova, or eggs, are removed from the…

Io, in astronomy

(Encyclopedia) IoIoīˈō [key], in astronomy, one of the 39 known moons, or natural satellites, of Jupiter. Io is subject to Jupiter's enormous tidal forces and is, as a result, the most volcanically…

ion, in chemistry

(Encyclopedia) ion, atom or group of atoms having a net electric charge. Ionization has many applications. Vapor lamps and fluorescent lamps take advantage of the light given off when positive ions…

abacus, in architecture

(Encyclopedia) abacusabacusăbˈəkəs [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…