Chou Collection, Middle Volume. Radical: Earth (tǔ). Qian. Kangxi strokes: 14. Page 237, Entry 03.
Tang Rhymes (Tangyun), Collection of Rhymes (Jiyun), Rhyme Meetings (Yunhui), and Orthodox Rhymes (Zhengyun): Pronounced qian (falling tone).
Explanatory Text on Characters (Shuowen): A pit. Also, a water-filled channel surrounding a city wall.
Records of the Grand Historian (Shiji), Annals of Qin: Digging through mountains and filling valleys for one thousand eight hundred li. Also written as qian (falling tone).
Records of the Grand Historian (Shiji), Annals of Qin: A channel beside the river.
Records of the Grand Historian (Shiji), Annals of Gaozu: Deep channels and standing guard.
Also written as qian (falling tone).
Biography of Sima Xiangru: Collapsing walls and filling channels.