yardarm ( synonym found)
Definition of yardarm:

°(nautical) The outer quarters of a horizontal spar attached to the mast athwartships, equipped with blocks for reeving signal halyards. (FM-55-501).
Definition of yardarm:

°(nautical) The outer quarters of a horizontal spar attached to the mast athwartships, equipped with blocks for reeving signal halyards. (FM-55-501).
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