adjective
(rare) castle-like: built or shaped like a castle.
(rare) Castled: having or furnished with castles.
(rare) Housed or kept in a castle.
verb
(transitive) To make into a castle: to build in the form of a castle or to add battlements to an existing building.
(intransitive, rare) To take the form of a castle.
noun
(historical, rare, obsolete) The district of a castle.