Jet, n.  [written also jeat, jayet.] Min. A variety of lignite, of a very compact texture and velvet black color, susceptible of a good polish, and often wrought into mourning jewelry, toys, buttons, etc. Formerly called also black amber.
 Jet ant Zool., a blackish European ant (Formica fuliginosa), which builds its nest of a paperlike material in the trunks of trees.


 Am·ber n.
 1. Min. A yellowish translucent resin resembling copal, found as a fossil in alluvial soils, with beds of lignite, or on the seashore in many places. It takes a fine polish, and is used for pipe mouthpieces, beads, etc., and as a basis for a fine varnish. By friction, it becomes strongly electric.
 2. Amber color, or anything amber-colored; a clear light yellow; as, the amber of the sky.
 3. Ambergris. [Obs.]
    You that smell of amber at my charge.   --Beau. & Fl.
 4. The balsam, liquidambar.
 Black amber, and old and popular name for jet.