Alidade

Pronunciation

• IPA: /ˈælɪdeɪd/

Alternative forms

• alhidade, alhidad, alidad all obsolete

Origin

From French alidade, from Spanish alidada, from Arabic عِضَادة, perhaps from عضد ("upper arm").

Full definition of alidade

Noun

1. (cartography, astronomy, surveying) A sighting device used for measuring angles.

Synonyms

• turning board, diopter obsolete