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(v l´ brôrt sn l, sn l s) (KEY) , 1591–1626, Dutch mathematician. He is generally credited with the discovery (1621) of the law of the refraction...
(sl ´v n) (KEY) , city (1993 pop. 106,958), E central Bulgaria, at the foot of the Balkan Mts. A textile center, it also produces carpets, wood and m...
fore-and-aft-rigged, single-masted sailing vessel with a single headsail jib. A sloop differs from a cutter in that it has a jibstay—a support leadi...
1912–, American sculptor, b. South Orange, N.J. Formerly an architect associated with Frank Lloyd Wright, Smith applies architectural principles to ...
a cleansing agent. It cleanses by lowering the surface tension of water, by emulsifying grease, and by absorbing dirt into the foam.
Ancient peoples a...
1845–1923, American naval officer, b. Albany, N.Y. He saw service in the Gulf of Mexico in the Civil War, was subsequently stationed with the Asian ...