Zi Collection, Middle Volume. Radical: Person (rén). Character: zhu. Kangxi stroke count: 7. Page: 97.
According to Tang Rhymes (Tangyun), pronounced zhu. According to Collected Rhymes (Jiyun) and Rhyme Anthology (Yunhui), pronounced zhu. Pronounced ning.
According to Literary Expositor (Erya), in the chapter Interpreting Ancient Terms (Shigu), zhu means a long time. According to Explaining Graphs and Analyzing Characters (Shuowen), zhu means to stand for a long time.
From the Book of Odes (Shijing), in the section Odes of Bei (Beifeng): Looking out but unable to see, I stand for a long time and weep.
From Qu Yuan, Encountering Sorrow (Lisao): Tying together the fragrant thoroughwort (lan) to stand waiting for a long time.