black-jack

noun12

1. •
   Any of certain species of Caranx of gamefish, including C. latus and C. crysos, but especially Caranx lugubris.
2. •
   Certain beggarticks (Bidens spp.), especially Bidens pilosa.
3. •
   A coalfish (Pollachius virens).
4. •
   A tufted or ring-necked scaup duck (Aythya collaris).
5. •
   Sphalerite; zincblende.
6. •
   Sphalerite.
7. •
   Larva of a turnip sawfly (Athalia rosae)

   • There is a sort of black caterpillar called a black jack, which is seldom seen; but when they do come, they make terrible havock. — 1807
8. •
   A larva of a sawfly of species Athalia rosae (syns. Athalia centifolia, A. spinarum).
9. •
   (no longer used) A large leather vessel for beer, etc.

   • ‘Oh yes, we’ll probably be wolfing down pasty jambics and swigging away at great black jacks of swingeing ale in no time now,’ he went on heartly. — 1936
10. •
    (no longer used) Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
11. •
    (no longer used) A water oak or barren oak (Quercus nigra).
12. •
    (no longer used) A native African longshoreman or sailor working on a boat.