Any of several wading birds of the genera Botaurus and Ixobrychus, having mottled brownish plumage and a deep booming cry in the male.
ETYMOLOGY:
Alteration (perhaps influenced by tern1) of Middle English bitour, from Old French butor, possibly from Vulgar Latin *buti-taurus : Latin bti, buzzard + Latin taurus, bull (after its cry); see tauro- in Appendix I.