Jack-stay: A stay along a mast or yard to which a sail is bent.
Jack-yard: A small yard used to extend the foot of a fore-and-aft balloon topsail that extends beyond the end of the gaff.
Jaws: The part of a gaff or boom which encircles the mast.
Jib: A triangular sail set on a stay in square-rigged ships, and then called a standing jib.
Jib-boom: A spar that extends beyond the bowsprit. A flying jib-boom is another spar that extends beyond the jib-boom.
Jib-foresail: The fore-staysail of fore-and-aft schooners.
Jib-purchase: A tackle used for setting up a jib.
Jib-topsail: A triangular sail set on the fore-topmast stay of fore-and-aft vessels.
Jib-traveller: The travelling ring that encircles the bowsprit to which the tack of a jib is secured and hauled out on the bowsprit or jib-boom, as the case may be.
Larboard: Port. (Obsolete.)