Related Clues:

• TAG Heuer competitor
• The end, to Euripides
• Letter after psi
• Corporate sponsor of Michael Phelps
• Literally, 'great O'
• Greek horseshoe?
• End of an alphabet
• Greek alphabet ending
• Luxury watch brand
• Seiko rival
• Zee : English :: ___ : Greek
• Alpha's complement
• 'Phi, chi, psi' follower
• Z's Greek counterpart
• ___-3 fatty acid