terret
/ˈtɛrɪt/
noun
- A metal ring or loop on a horse's harness through which the reins or driving lines pass.
- The rider checked that the reins were running smoothly through each terret before the ride.
- He replaced a broken terret on the horse's harness to ensure the lines wouldn't snag.
- The old leather harness had brass terrets that shone in the sunlight.