The Collaborative International Dictionary of English v.0.48:
Junk \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. Hence: Something worthless, or only worth its value as
4. (Naut.) Hard salted beef supplied to ships.
Junk bottle, a stout bottle made of thick dark-colored
Junk dealer, a dealer in old cordage, old metal, glass,
Junk hook (Whaling), a hook for hauling heavy pieces of
blubber on deck.
(a) A packing of soft material round the piston of a steam
(b) A metallic ring for retaining a piston packing in
(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.
WordNet (r) 3.0 (2006):
n 1: a shop that sells cheap secondhand goods