Where does “alidade” come from?

alidade (French) comes from Spanish alidada, from Arabic عِضَادَة, from Arabic عَضُد — upper arm.

Ancestry of “alidade”, step by step

Step	Language	Word	Meaning
1	Spanish	alidada	—
2	Arabic	عِضَادَة	—
3	Arabic	عَضُد	upper arm