means A powerful, violent whirlpool — or, by extension, any scene of turbulent, chaotic confusion.

from From Dutch maelstrom, an early name for a notorious tidal whirlpool off the coast of Norway, built from malen 'to grind, whirl' and stroom 'stream' — literally a grinding current. The word entered wider European languages and English imagination partly through old maps and travellers' tales of that fearsome Arctic vortex, and it was cemented in English by writers who loved its drama; only later did it loosen from the sea to describe any swirling mess of events.