Rhyming Dictionary (Zhengyun) pronunciation is pi (oblique tone) mian (oblique tone) cut, sound same as "bian". "Yupian" explains it as the dougong on a pillar. Also written as "guan".
○ Note: "Zihui" considers it the same as "bian", and "Zhengzitong" considers it a mistaken character for "bian". Both these statements are incorrect.