In a large bowl combine the flour, water, salt, pepper and greek oregano. Mix until combined. You should end up with a batter which is relatively runny, so that the batter very lightly coats your zucchini rounds.
Pour enough oil into the frying pan so that it comes 1/2 to 3/4 inches up the side of the frying pan. Heat over medium / high heat.
Take your zucchini slices, and coat each one individually with the batter. Prior to adding to the oil, wipe the zucchini slice against the side of the bowl to ensure that any excess batter is removed.
Carefully place one zucchini slice (battered) into the oil. When it starts to sizzle, your oil is hot enough. Add more zucchini rounds to your pan, being careful not to overcrowd them.
Cook on one side for a minute or so, until they are golden brown. Using tongs or a fork, carefully flip the rounds over and cook on the opposite side for another minute or two, until golden brown.
Lift each chip out of the pan one by one, allowing any excess oil to pour off into the pan. Allow to cool slightly on a paper towel lined dish. At this point you can sprinkle some additional salt on them.