Bittern \Bit"tern\, n. [OE. bitoure, betore, bitter, fr. F. butor; of unknown origin.]

(Zo["o]l.) A wading bird of the genus Botaurus, allied to the herons, of various species.

Note: The common European bittern is Botaurus stellaris. It makes, during the brooding season, a noise called by Dryden bumping, and by Goldsmith booming. The American bittern is B. lentiginosus, and is also called stake-driver and meadow hen. See Stake-driver.

Note: The name is applied to other related birds, as the least bittern (Ardetta exilis), and the sun bittern.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Bittern \Bit"tern\, n. [From Bitter, a.]

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. --Cooley.

Source: Webster's Revised Unabridged Dictionary (1913)