| organ |
a fully differentiated structural and functional unit in an animal that is specialized for some particular function a government agency or instrument devoted to the performance of some specific function; "The Census Bureau is an organ of the Commerce Department" electric organ: (music) an electronic simulation of a pipe organ a periodical that is published by a special interest group; "the organ of the communist party" wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard harmonium: a free-reed instrument in which air is forced through the reeds by bellows
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| osteoma |
a slow growing benign tumor of consisting of bone tissue; usually on the skull or mandible
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| oral stage |
(psychoanalysis) the first sexual and social stage of an infant's development; the mouth is the focus of the libido and satisfaction comes from suckling and chewing and biting
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| overstress |
overemphasize: place special or excessive emphasis on; "I cannot overemphasize the importance of this book"
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| optical illusion |
an optical phenomenon that results in a false or deceptive visual impression
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