Nearly done, I have 1 and 2/3 answers to find. I have 12 down but not the ones before it 20 and 17 down but figure if I can get 23 across it might help. So all I really want to know is at this point please, is the definition of 23 across " Olympians are Greek, skirting oxygen-free cavity" either Olympians or Cavity. Thanks for the hint