One of the mysteries of the English language finally explained.
1Of a nail, screw, or bolt: having a rounded end or top.
2Generally. Having a round, curved, or circular end or top.
3Architecture. Of an arch, window, etc.: having a semicircular top.
4Of a tree or other plant: having a rounded form or crown, or a rounded flower or seed head.
5Of an animal: having a rounded head.
6Physical Anthropology. Designating a race or type of man characterized by a skull of rounded shape.
7Of a person: having short, closely cropped hair; specifically (British historical) that is a Roundhead. Now rare.
Mid 16th century. From round + headed. In specific use in sense 4 after roundhead.
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