Definition of "hubcap" [hubcap]

• A round covering over the hub of the wheel of a motor vehicle. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A lieutenant reported a loud bang he described as a hubcap rolling on the floor — or an air vent being popped onto a roof?"
• "The hubcap is the cover on the wheel, and sometimes its got kind of a sporty design."
• "The tail rotor, for instance, had extra blades to make it quieter in the air, and was covered with a disc-shaped device sometimes referred to as a "hubcap.""