bittern

Short definition from Wiktionary

Noun

1. 1
   Several bird species in the Botaurinae subfamily of the heron family Ardeidae.
2. 2
   The liquor remaining after halite (common salt) has been harvested from saline water (brine).
3. 3
   The saline substance added to soy milk to coagulate it as a primary step in the production of tofu.
4. 4
   A very bitter compound of quassia, cocculus indicus, etc., used by fraudulent brewers in adulterating beer.