I. ˈbi-tərn noun
Etymology: Middle English bitoure, from Anglo-French butor, from Vulgar Latin * butitaurus, from Latin buteo hawk + taurus bull
Date: 1515
: any of various small or medium-sized usually secretive herons (especially genera Botaurus and Ixobrychus )
II. noun
Etymology: irregular from bitter (I)
Date: 1682
: the bitter water solution of salts that remains after sodium chloride has crystallized out of a brine