yardarm

Either end of a yard of a square sail.

See yard, n., 5.

Either half of a square-rigged vessel’s yard{6}, from the center or mast to the end.

The portion of a yard{6} outboard of the slings, often called the outer quarter.

The outer quarters of a horizontal spar attached to the mast athwartships, equipped with blocks for reeving signal halyards.

either end of the yard of a square-rigged ship