Webster's Revised Unabridged Dictionary · 1913

Alcaid

Alcaid ({not transcribed}) , noun

[Sp. alcaide, from Arabic al-qāīd governor, from qāda to lead, govern.]

1.
A commander of a castle or fortress among the Spaniards, Portuguese, and Moors.
2.
The warden, or keeper of a jail.

Also: Alcayde