Junk n. : A fragment of any solid substance; a thick piece. See Chunk.

Junk n. : Pieces of old cable or old cordage, used for making gaskets, mats, swabs, etc., and when picked to pieces, forming oakum for filling the seams of ships.

Junk n. : Old iron, or other metal, glass, paper, etc., bought and sold by junk dealers.

Junk n. : Hard salted beef supplied to ships.

Junk n. : A large vessel, without keel or prominent stem, and with huge masts in one piece, used by the Chinese, Japanese, Siamese, Malays, etc., in navigating their waters.

Example:
What is the best way to get rid of Junk mail through the post office?

Taxonomy
junks, sails, Chinese junks, compartments, boat, rudder, the Chinese, vessels, design, wind, crew, masts, Mauro, map, China, sailors, junk rig, sailing vessels.

Defination from the web:
junk is a Chinese sailboat design dating from ancient times and still in use today. ... Junk sails have much in common with the most aerodynamically efficient sails used today in windsurfers or catamarans, although their design can ...