J. Robert Oppenheimer


J(ulius) Robert, 1904–67, U.S. nuclear physicist.
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World English Dictionary
Oppenheimer (ˈɒpənˌhaɪmə)
J(ulius) Robert. 1904--67, US nuclear physicist. He was director of the Los Alamos laboratory (1943--45), which produced the first atomic bomb. He opposed the development of the hydrogen bomb (1949) and in 1953 was alleged to be a security risk. He was later exonerated

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American Heritage
Science Dictionary
Oppenheimer   (ŏp'ən-hī'mər)  Pronunciation Key 
American physicist who directed the Los Alamos, New Mexico, laboratory during the development of the first atomic bomb (1942-1945). After World War II, he became an advocate for the peaceful use of atomic energy and opposed the development of the hydrogen bomb.
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