alidad

English Thesaurus

1. surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles (noun.artifact)

hypernym	:	surveying instrument, surveyor's instrument, surveying instrument, surveyor's instrument,
definition	:	an instrument used by surveyors (noun.artifact)

2. surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments (noun.artifact)

part meronym	:	theodolite, transit,
definition	:	a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod (noun.artifact)