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A helmet intended to be worn while riding a bicycle.
1989 (Jul), Dennis Coello, "Lock Up Your Bike", Boys' Life, page 8
Make locking up your bike as routine as strapping on a bicycle helmet.
2004, World Health Organization, World Report On Road Traffic Injury Prevention, page 136:
Mandatory bicycle helmet laws introduced in New Zealand in 1994 also resulted in large increases in helmet use, and reductions in the number of head injuries[…]
bicycle helmet on Wikipedia.Wikipedia 