[Probably alteration (influenced by Latin albus, white) of alcatras, pelican, from Portuguese or Spanish alcatraz, from Arabic al-ġaṭṭās : al-, the + ġaṭṭās, diver, sea eagle (from ġaṭasa, to plunge, dive; see ġṭs in the Appendix of Semitic roots). Sense 2, after the albatross in "The Rime of the Ancient Mariner" by Samuel Taylor Coleridge, which the mariner killed and had to wear around his neck as a penance .]