Guangyun, Jiyun, and Yunhui record the pronunciation as liao (falling tone). Zhengyun records the pronunciation as liao (falling tone). The pronunciation is the same as the word for to burn. Shuowen Jiezi explains it as a surrounding wall. The commentary cites the line from the Western Capital Rhapsody (Xidu Fu) which says to surround with a perimeter wall.
Furthermore, Guangyun records the pronunciation as liao (level tone). Jiyun and Yunhui record the pronunciation as liao (level tone). The pronunciation is the same as the word for chat. The meaning is the same. Textual research: Shuowen explains it as a surrounding wall. In the Western Capital Rhapsody by Ban Gu, it is written as to surround with a perimeter wall. Careful note: The original text of the Western Capital Rhapsody reads to coil with a perimeter wall. The version here, written as to surround with a perimeter wall, is what is cited in the commentary to the Shuowen Jiezi Xichuan. The characters Ban Gu have now been changed to commentary citation.