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| YACHT | A vessel of pleasure or state. |
| YARD | A long piece of timber, tapering slightly toward the ends, and hung by the centre to a mast, to spread the square sails upon. |
| YARD-ARM | The extremities of a yard. |
| YARD-ARM AND YARD-ARM |
The situation of two vessels, lying alongside one another, so near that their yard-arms cross or touch. |
| YARN | See ROPE-YARN. |
| YAW | The motion of a vessel when she goes off from her course. |
| YEOMAN | A man employed in a vessel of war to take charge of a storeroom; as, boatswain's yeoman the man that has charge of the stores, of rigging, &c. |
| YOKE | A piece of wood placed across the head of a boat's rudder, with a rope attached to each end, by which the boat is steered. |
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