- a. A lightweight protective helmet, usually of metal or reinforced plastic, worn by workers in industrial settings.b. Informal A construction worker.
- Slang a. An ultraconservative.b. An extremely patriotic person with a conventional, usually unquestioning sense of morality.
- Relating to heavy industry, construction, or demolition.
- Informal Of, relating to, or characterized by extreme conservatism.
- Slang Extremely patriotic.
- Alternative spelling of hard hat.