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"Bittern" Definition

noun

Any of several wading birds of the genera Botaurus and Ixobrychus, having mottled brownish plumage and a deep booming cry in the male.
The bitter water solution of bromides, magnesium, and calcium salts remaining after sodium chloride is crystallized out of seawater.
Any of various small or medium-sized usually secretive herons (especially genera and ).
The water solution of salts that remains after sodium chloride has crystallized out of a brine.