A surveying instrument used to measure vertical and horizontal angles.
Webster's New World
Other Word Forms of Theodolite
Origin of Theodolite
Probably coined by Leonard Digges (1520–1559), English mathematician and surveyor, as the name of a device for measuring horizontal angles perhaps from Greek theā a viewing a second element of unknown origin
From American Heritage Dictionary of the English Language, 5th Edition
From New Latin theodolitus, of unknown origin.
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