Webster's Revised Unabridged Dictionary · 1913

Bittern

Bittern ({not transcribed}) , noun

[Old English bitoure, betore, bitter, from French butor; of unknown origin.]

(Zoology) A wading bird of the genus Botaurus, allied to the herons, of various species.

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 Botaurus lentiginosus, and is also called stake-driver and meadow hen. See Stake-driver.

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

Bittern , noun

[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