castellate

castle-like: built or shaped like a castle.

...The living porphyry, in towers around Grotesquely castellate...

Castled: having or furnished with castles.

...Heights castellate...

Housed or kept in a castle.

To make into a castle: to build in the form of a castle or to add battlements to an existing building.

The citizen who castellates a Villa at Richmond...

To take the form of a castle.

...Clouds slowly castellating in a calm...

The district of a castle.

In the Castellate of Roger of Poictou...