Related Clues:

• Eighteen-wheelers
• A Washington office shape
• Out-of-round
• Like some mirrors
• Somewhat round
• Shaped like Humpty
• Like Poe's 'Portrait'
• Big rigs
• Football stadium shape
• In the form of a race track
• Zero-shaped
• Cameo shape
• Like lilac leaves
• Racetrack
• Convoy constituents