Related Clues:

• It's part of Xmas
• X, to frat men
• X, in old Rome
• X, to Greeks
• Greek ''X''
• The Bears, on scoreboards
• Existential life force
• Vital life force, in acupuncture
• It's not nice to fool her
• Third-to-last Greek letter
• N.L. and A.L. city
• ___-town (the Windy City)
• X, to Hippocrates
• Tai __
• Ill. metropolis