roundhead

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

Having a dome-shaped head.

The roundhead screw and its fraternal twins, the button head and pan head screws, have a head that is flat on the bottom and hemispherical on top.

You can use flat-head screws and plug the holes, or you can use roundhead blue screws and let the heads project.

A roundhead screw, one with a domed head.

Alternative letter-case form of Roundhead (“parliament supporter in the English Civil War”)

You roundhead whore, sock it up, or me will kill you, begar.

Colonel Middleton was dismounted amongst the king's forces, of whom one, taking him for a commander of their's, mounted him again, and bid him make haste, and kill a roundhead ; and so he escaped.

A male whose penis is circumcised.

The roundheads in the school showers easily equalled the cavaliers.

Since penile preference is so tied up with personal aesthetics and body image, it seems both logical and fair to leave the choice of cavalier or roundhead to the owner of the organ, thus avoiding the sort of life-long pain expressed in a comment like this:[…]

A circular platform at the end of a pier or breakwater.

The top of the caisson will be at the same level as the bag-work foundation of the pier, and a roundhead, composed of 45-ton granite faced concrete blocks, will be built on it.

The smallness of the damage done at Purfleet is remarkable, when it is remembered that the impact of a large steamship is sufficient to cut deeply into solid masonry piers, and that only in 1907 the effect of a collision against the souther breakwater of the Admiralty Harbour, Dover, was to sever the roundhead entirely from the body of the pier, in addition to causing other serious injuries.

Any of various agarics of the genus Stropharia.