alidade(redirected from alidades)
Also found in: Dictionary, Thesaurus.
Related to alidades: telescopic alidade
alidade(al -ă-dayd) See astrolabe.
An instrument for topographic surveying and mapping by the plane-table method.
Any sighting device employed for angular measurement.
The part of a surveying instrument which consists of a sighting device, with index, and reading or recording accessories.