alidade

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alidade

(al -ă-dayd) See astrolabe.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

alidade

[′al·ə‚dād]
(engineering)
An instrument for topographic surveying and mapping by the plane-table method.
Any sighting device employed for angular measurement.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

alidade

The part of a surveying instrument which consists of a sighting device, with index, and reading or recording accessories.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.