alidade

Definition of Alidade in English :

1. alidad, alidade

surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments

2. alidad, alidade

surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles

WordNet Lexical Database for English. Princeton University. 2010.

Alidade

noun

1.

a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements

2.

the upper rotatable part of a theodolite, including the telescope and its attachments

noun

1.

a part of an optical or surveying instrument, consisting of the vernier, indicator, etc.

2.

a surveying instrument consisting of a telescope mounted on a rule, used in topography

n.

1. An indicator or a sighting apparatus on a plane table, used in angular measurement.

2. A topographic surveying and mapping instrument used for determining directions, consisting of a telescope and attached parts.