alcorque

tree grating (metal covering around the base of a tree, usually on a sidewalk); tree well (ridge of soil around a tree to conserve water)

Variant of what is found in Portuguese, beside alcorque and alcorca, more originally as alcarque and alfarque, borrowed from well-known Arabic الْخَرْق (al-ḵarq, “breakthrough”) as employed in the sense of a rift for water. Northwestern Arabic قُرْق (qurq, “shoe, sandal”) is a reborrowing from Romance.