- (by extension) Politically radical.
- Of, or related to the radical French political club that was a driving force of the French Revolution.
- (by extension) A political radical.
- A member of a radical French political club founded (at an old Jacobin convent) in 1789 and one of the driving forces of the French Revolution.
- A Dominican friar.
- A breed of domestic pigeon (known for its feathered hood over its head).