Related Clues:

• Prefix denoting 3
• Prefix for color or cycle
• Quadri- less one
• Prefix with cycle or city
• Ten (Pref.)
• Angle starter?
• "Angle" lead-in
• Twice quattuor
• Prefix with athlete or state
• Pi preceder?
• Kilo : 1000 :: ___ : 10
• Prefix with -syllabic
• Part of 8-Down
• Motor and cycle leader
• Star opening?