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Semyonov, Nikolay Nikolayevich
(Encyclopedia)Semyonov, Nikolay Nikolayevich, or Nikolai Nikolaevic Semenov, 1896–1986, Soviet physical chemist, Ph.D. Petrograd Univ., 1917. Semyonov was a professor at the Leningrad Physico-Technical Institute ...guided missile
(Encyclopedia)guided missile, self-propelled, unmanned space or air vehicle carrying an explosive warhead. Its path can be adjusted during flight, either by automatic self-contained controls or remote human control...glider
(Encyclopedia)glider, type of aircraft resembling an airplane but having at most a small auxiliary propulsion plant and usually no means of propulsion at all. The typical modern glider has very slender wings and a ...pump
(Encyclopedia)pump, device to lift, transfer, or increase the pressure of a fluid (gas or liquid) or to create a vacuum in an enclosed space by the removal of a gas (see vacuum pumps under vacuum). The centrifugal ...Cousteau, Jacques Yves
(Encyclopedia)Cousteau, Jacques Yves zhäk ēv ko͞ostōˈ [key], 1910–97, French oceanographer and naval officer. In 1943, with Émil Gagnan, he invented the self-contained underwater breathing apparatus (scuba)...mercaptan
(Encyclopedia)mercaptan thīˈōl [key], any of a class of organic compounds containing the group –SH bonded to a carbon atom. The volatile low-molecular-weight mercaptans have disagreeable odors. Mercaptans are ...Voyager, airplane
(Encyclopedia)Voyager, the first airplane to circumnavigate the earth nonstop on a single load of fuel. Designed by Burt Rutan and flown by Dick Rutan and Jeana Yeager, Voyager took off from California on Dec. 14, ...seaplane
(Encyclopedia)seaplane, airplane designed to take off from and alight on water. The two most common types are the floatplane, whose fuselage is supported by struts attached to two or more pontoon floats, and the fl...injection
(Encyclopedia)injection, introduction of a fluid into the body, usually by means of a needle and syringe. The material injected may be a test substance (as in determining allergic sensitivity or immunity to a disea...Bernese mountain dog
(Encyclopedia)Bernese mountain dog bərnēzˈ [key], breed of sturdy working dog first brought to Switzerland by the invading Roman armies over two millennia ago. It stands from 23 to 27 in. (58–69 cm) high at th...Browse by Subject
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