Yupian (Yuankanben) Guangyun Jiyun Shiming Fangyan Erya Boya (according to Jiyun) Guangya (according to Jiyun)
id du Shuowen
Shuowen: volume 08a, page 168a.11 addition
radical:
287 到聲
fanqie: 當老切 [tɑu]
this character is not in the Duanzhu