albatross

\ \ [17] The word albatross has a confused history. The least uncertain thing about it is that until the late 17th century it was alcatras; the change of the first element to albaseems to have arisen from association of the albatross’s white colour with Latin albus ‘white’. However, which particular bird the alcatras was, and where the word alcatras ultimately came from, are much more dubious.

\ \ The term was applied variously, over the 16th to the 19th centuries, to albatrosses, frigate birds, gannets, gulls, and pelicans. Its immediate source was Spanish and Portuguese alcatraz ‘pelican’ (hence Alcatraz, the prison-island in San Francisco Bay, USA, once the haunt of pelicans), which was clearly of Arabic origin, and it has been speculated that it comes from Arabic al qādūs ‘the bucket’, on the premise that the bucket of a water-wheel used for irrigation resembles a pelican’s beak. Arabic qādūs itself comes from Greek kádos ‘jar’.