- The arched upper part (galea) of the corolla in some flowers, esp. those of the mint and orchid families
- a protective headgear made of hard material to resist blows
- armor plate that protects the head
- (helmeted) equipped with or wearing a helmet
- A hard or padded protective hat, various types of which are worn by soldiers, police officers, firefighters, motorcyclists, athletes, and others
- A predatory mollusk with a squat heavy shell, living in tropical and temperate seas and preying chiefly on sea urchins