cyclone
noun
[ ˈsʌɪkləʊn ]
• a system of winds rotating inwards to an area of low barometric pressure, with an anticlockwise (northern hemisphere) or clockwise (southern hemisphere) circulation; a depression.
Origin:
mid 19th century: probably from Greek kuklōma ‘wheel, coil of a snake’, from kuklos ‘circle’. The change of spelling from -m to -n is unexplained.
