Etymology
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theodolite (n.)

surveying instrument, 1570s, of unknown origin (see OED for discussion). "The word has a Gr[eek] semblance, but no obvious Gr[eek] basis" [Century Dictionary].

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Definitions of theodolite

theodolite (n.)
a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod;
Synonyms: transit
From wordnet.princeton.edu