Chou Collection, Upper Volume Radical: Mouth (kǒu) Xu Kangxi strokes: 14 Page 206, Entry 10 Tang Rhymes (Tangyun): Pronounced xu. Collected Rhymes (Jiyun), Rhyme Compilation (Yunhui), and Correct Rhymes (Zhengyun): Pronounced xu. According to the Analytical Dictionary of Characters (Shuowen Jiezi), it means to blow. According to the Jade Chapters (Yupian), it means to blow out breath. According to the Categorized Sounds (Shenglei), rapid exhalation is called blowing, while slow exhalation is called xu. According to the Correct Rhymes, pursing the lips to expel air is called blowing, while relaxing the mouth to expel air is called xu. Blowing air originates from the lungs and belongs to the yin, hence it is cold; expelling air from the cinnabar field belongs to the yang, hence it is warm. From the Zhuangzi, Chapter on the Revolution of Heaven (Tianyun pian): Who exhales and inhales this. Also, from the chapter Xu Wugui: Looking up to the sky and exhaling. According to the Collected Rhymes, it is also written as xu. Note: The Correct Rhymes states that it is also written with the characters pronounced xiong, which belong to the yu rhyme category, whereas xu belongs to the yu rhyme category; their pronunciations differ, so the Correct Rhymes is incorrect. Also, according to the Extensive Rhymes (Guangyun), Collected Rhymes, Rhyme Compilation, and Correct Rhymes: Pronounced xu (falling tone). The meaning is the same. Note: Various rhyme books use this character form. The Compendium of Characters (Zihui) and the Corrected Meaning of Characters (Zhengzitong) use the current character form. It was appended to the twelve-stroke section, which is incorrect; it has now been corrected.