Roundhead

Meanings

1. A supporter of parliament during the English Civil War (in the 17th century).

1. Having a dome-shaped head.

1. A roundhead screw, one with a domed head.
2. Alternative letter-case form of Roundhead (“parliament supporter in the English Civil War”)
3. A male whose penis is circumcised.
4. A circular platform at the end of a pier or breakwater.
5. Any of various agarics of the genus Stropharia.

Etymology

From round + head, from their short-cropped hairstyle.