cyclonic

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cyclonic

[sī′klän·ik]
(geophysics)
Having a sense of rotation about the local vertical that is the same as that of the earth's rotation: as viewed from above, counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere, undefined at the Equator.

cyclonic

The counterclock-wise airflow around a low-pressure system in the Northern Hemisphere (clock-wise in the Southern Hemisphere).