Definition of theodolite noun from the Oxford Advanced Learner's Dictionary

 

theodolite

 noun
noun
BrE BrE//θiˈɒdəlaɪt//
 
; NAmE NAmE//θiˈɑːdəlaɪt//
 
 
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a piece of equipment used by surveyors for measuring angles Word Origin late 16th cent. (originally denoting an instrument for measuring horizontal angles): from modern Latin theodelitus, of unknown origin.
See the Oxford Advanced American Dictionary entry: theodolite