castellate

Century Dictionary and Cyclopedia

1. n. A lordship or castellany.
2. To give a castle-like form or appearance to; furnish with turrets and battlements in the manner of a castle.
3. To assume castle-like forms, as moving clouds.
4. Same as castellated.

Wiktionary

1. v. To build in the form of castle; to add battlements to an existing building