Sentence:  Because of the cars' size, <WSD>minicup</WSD> drivers as young as eight years old race in a youth division. The sport is run by the Miniature Motorsports Racing Association (MMRA). 
Meaning of the word marked with <WSD> tags:  A miniature version of one of the cars used in NASCAR's Sprint Cup events, used in races run by the Miniature Motorsports Racing Association.