Wu Collection, Middle Volume Radical: Sickness (bìng) Zhu Kangxi Stroke Count: 13 Page 776, Entry 06 Pronounced zhu Shuowen Jiezi (Explaining Single-component Characters and Analyzing Compound Characters): Swelling or lumps caused by extreme cold. Yupian (Jade Chapters): Sores on hands and feet caused by cold. Zhengyun (Standard Rhymes): Cold sores. History of the Former Han (Qian Hanshu), Biography of Zhao Chongguo: Hands and feet chapped and afflicted with cold sores. Commentary: Wen Ying says: Zhu is a sore caused by cold. Also: In times of frost and snow and plagues, there is the affliction of cold sores and falling extremities. Commentary: This refers to fingers or toes falling off due to freezing. Zhengzitong (Comprehensive Compilation of Characters): Popularly known today as frostbite on the heels. Yupian (Jade Chapters): Sometimes also written in a variant form.