British History. Applied by supporters of the Parliament in the English Civil War, and (after the execution of Charles I) supporters of the…

Of a person: having short, closely cropped hair; spec. (British historical) that is a Roundhead. Now rare.

Of or relating to a parliament, parliamentary; spec. belonging to or designating the Parliamentarians in the English Civil War.

Of, relating to, or adhering to the Parliament in the English Civil War. Cf. parliament man, n. 2. Now British History.

British History. Usually with capital initial. Belonging to, relating to, or characteristic of the Roundheads.