alidade
/ˈalɪdeɪd
/noun
A sighting device or pointer for determining directions or measuring angles, used in surveying and (formerly) astronomy.A pointer, called an alidade, was pivoted at the centre of the disk....
- A wide variety of alidades and plane tables are available, both in manual and electronic versions.
- In the circle an index on the alidades gives the angle that they form with the vertical diameter.
Origin
Late Middle English: directly or (in modern use) via French and Spanish from Arabic al-‘iḍāda 'the revolving radius', probably based on aḍud 'upper arm'.
- fairy table
- fairy tale
- fairy-tale ending
- fairy-tale-ish
- fairy-tale prince
- fairy-tale princess
- fairy tern
- fairy thimble
- fairy treasure
- fairy wand
- fairy wealth
- fairy weed
- fairy wing
- fairy wren
- Faisal
- Faisalabad
- faisandé
- fait accompli
- faith
- faith-based
- faith community
- faith crime
- faith cure
- faith-curer
- faith curist