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From WordNet (r) 2.0 : [ wn ]
optical instrument n : an instrument designed to aid visionFrom English - German Ding/FreeDict dictionary ver. 1.9-fd1 : [ freedict:eng-deu ]
optical instrument /ˈɒptɪkəl ˈɪnstɹəmənt/ optisches Instrument, optisches Gerät see: optical, optical control, optical illusion