Bittern

n.	1.	(Zool.) A wading bird of the genus Botaurus, allied to the herons, of various species.
	1.	The brine which remains in salt works after the salt is concreted, having a bitter taste from the chloride of magnesium which it contains.
	2.	A very bitter compound of quassia, cocculus Indicus, etc., used by fraudulent brewers in adulterating beer.

Noun

1.

bittern - relatively small compact tawny-brown heron with nocturnal habits and a booming cry; found in marshes

American bittern, Botaurus lentiginosus, Botaurus stellaris, European bittern, heron, Ixobrychus exilis, least bittern, stake driver