helmet
US /ˈhel.mət/
UK /ˈhel.mət/

1.
casco, elmo
a hard or padded protective hat, a piece of armor designed to protect the head
:
•
Always wear a helmet when riding a bicycle.
Indossa sempre un casco quando vai in bicicletta.
•
The knight wore a shining helmet into battle.
Il cavaliere indossava un elmo lucente in battaglia.