Related Clues:

• W.W. II Japanese fighter planes
• Racing forms?
• They mean nothing
• Places to run
• Circuits for 55-Across
• Round figures
• Face shapes
• Six in 1,000,000
• Certain driveways
• Elliptical shapes
• Most of a 1,000,000,000
• Stretched circles
• Running tracks
• Speed skaters' track shapes
• Elongated circles