1. [n]  a narcotic that is considered a hard drug; a highly addictive morphine derivative
2. [n]  any of various Chinese boats with a high poop and lugsails
3. [n]  the remains of something that has been destroyed or broken up
4. [v]  dispose of (something useless or old); "trash these old chairs"; "junk an old car"; "scrap your old computer"

Junk
Description not available.

more details ...

1. \Junk\, n.
   A fragment of any solid substance; a thick piece. See
   {Chunk}. [Colloq.] --Lowell.
   

2. \Junk\, n. [Pg. junco junk, rush, L. juncus a bulrush, of
   which ropes were made in early ages. Cf. {Junket}.]
   1. 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.
   2. Old iron, or other metal, glass, paper, etc., bought and
      sold by junk dealers.
   3. (Naut.) Hard salted beef supplied to ships.
   {Junk bottle}, a stout bottle made of thick dark-colored
      glass.
   {Junk dealer}, a dealer in old cordage, old metal, glass,
      etc.
   {Junk hook} (Whaling), a hook for hauling heavy pieces of
      blubber on deck.
   {Junk ring}.
      (a) A packing of soft material round the piston of a steam
          engine.
      (b) A metallic ring for retaining a piston packing in
          place;
      (c) A follower.
   {Junk shop}, a shop where old cordage, and ship's tackle, old
      iron, old bottles, old paper, etc., are kept for sale.
   {Junk vat} (Leather Manuf.), a large vat into which spent tan
      liquor or ooze is pumped.
   {Junk wad} (Mil.), a wad used in proving cannon; also used in
      firing hot shot.
   

3. \Junk\, n. [Pg. junco; cf. Jav. & Malay jong, ajong, Chin.
   chwan.] (Naut.)
   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.