deosil means 'to go with the sun' ie. to anti-clockwise/counter-clockwise or turn leftward in the Southern Hemisphere; to turn rightward or go clockwise in the Northern Hemisphere.

The opposite of widdershins.

Where deosil is used the most, i.e. Europe and North America, it means specifically clockwise. It is the more cheerful (and safe) way of opening a circle. Go ask your superstitious old aunt what I'm talking about.