Roundhead
/ˈraʊndhed/
Definition 1 of 2
Pro Tip 1/3Historical Faction
Use 'roundhead' to refer to the Parliamentary faction in English Civil War history. 
The museum exhibit featured weapons used by the Roundheads.
Pro Tip 2/3Cultural Symbol
'Roundhead' symbolizes political and religious beliefs opposing the monarchy in 17th-century England. 
The Roundhead stance was driven by a desire for constitutional government.
Pro Tip 3/3Archaic Term
In modern contexts, 'roundhead' is outdated; use it primarily for historical discussions. 
She wrote a paper comparing Roundheads and Cavaliers.