Hai Collection, Middle Volume
Radical: Fish (yú)
Character: Geng
Kangxi strokes: 18
Page 1471, Entry 06
Pronounced geng (falling tone).
Shuowen Jiezi (Dictionary of Explanations of Characters) states: Originally written as the variant form, it refers to fish bones.
Guangyun (Broad Rhymes) states: A fish bone stuck in the throat.
Commentary on the Book of Etiquette and Ceremonial (Yili), regarding the offerings for the lord’s banquet: Dried fish from the fatty part has many bones and is difficult to swallow.
Biography of Jia Shan in the Book of Han (Qianhan Shu): Wishing to offer blunt remonstrance from the rear.
Also, in Guangyun: Referring to an upright and outspoken official.
Biography of Lai Xi in the Book of the Later Han (Houhan Shu): Grand Master of Palace Arrangements Duan Xiang is an upright and outspoken official who can be entrusted with responsibility. Commentary: Gu-geng refers to someone who is upright and straightforward.
Huainanzi (Master of Huainan): The dragon gives birth to the kun-geng.
Also, the same as the character geng (thorny/to hinder).
Biography of Yin Ying in the Book of the Later Han (Houhan Shu): Until now it remains a hindrance. Commentary: The same as the character geng.
In Jiyun (Collection of Rhymes): Pronounced geng (level tone). The meaning is the same.