helmetnoun [ C ]uk /ˈhel.mət/ us /ˈhel.mət/
a crash helmet 防撞頭盔
a bicycle helmet 摩托車安全帽
- It's very risky to ride your bike without wearing a cycle helmet.
- To keep the helmet in position, fasten the strap beneath the chin.
- Is the strap on this helmet adjustable?
- He pulled on his helmet and straddled the motorbike.
- You cannot come onto the building site unless you're wearing a helmet.