incastellate

incastellate means to make into a castle.

Etymology

First attested in 1552; borrowed from Medieval Latin incastellātus, perfect passive participle of incastellō (“to fortify, incastle, incastellate”) from in- (“in-: make into”) + castellum (“little fortification, castle; cistern”). Cognate with Italian incastellare.

verb

To make into a castle.
To enclose a well or cistern with masonry.

Definitions & examples from Wiktionary (CC BY-SA 3.0).