"A curse is the effective action of supernatural power, distinguished solely by the quality of adversity that it brings"
"The curse" is a term for the original sin of Adam and Eve in the Christian religion, and a slang term for menstruation.
"German people, including the Pennsylvania Dutch speak in terms of hexing (from the german word for witchcraft), and a common hex in days past was that laid by a stable-witch who caused milk cows to go dry and horses to go lame. . "
"The tradition is also called hex or hex work, or Speilwerk in Pennsylvania Dutch; its adepts are hexenmeisters. The tradition of Hex signs painted on Pennsylvania barns in some areas originally relates to this tradition, as the symbols were pentagrams thought to have talismanic properties; though many current hex signs are made simply for decoration."
"The deliberate levying of curses is often part of the practice of magic"
"Most established religions forbid such practices outright"
so if you are german or dutch, its a hex, otherwise it it a curse ;p