Chou Collection, Upper Volume Radical: Mouth (kǒu) Xu Kangxi strokes: 14 Page 206, Entry 01 Tang Rhymes: Pronounced xu. Collected Rhymes, Rhyme Assembly, and Correct Rhymes: Pronounced xu. Analytical Dictionary of Characters: To blow. Jade Chapters: Blowing and exhaling. Classification of Sounds: Exhaling breath rapidly is called chui; exhaling breath slowly is called xu. Correct Rhymes: Puckering the lips and expelling breath is called chui; forming the mouth into an empty shape and expelling breath is called xu. Exhaling breath from the lungs belongs to the yin element, hence it is cold. Exhaling breath from the cinnabar field belongs to the yang element, hence it is warm. Zhuangzi, Heaven's Revolution (Tianyun): Who exhales and inhales this? Also, Xu Wugui: Looking up to the sky and exhaling. Collected Rhymes: Also written as the variant form (xu). Note: The Correct Rhymes states it is also written as three variant forms. Those three characters are pronounced xiong, belonging to the yu rhyme, while xu belongs to the yu rhyme; their pronunciations differ, so the Correct Rhymes is incorrect. Broad Rhymes, Collected Rhymes, Rhyme Assembly, and Correct Rhymes: Pronounced xu (falling tone). The meaning is the same. Note: Various rhyme books write it as xu. The Dictionary of Characters and Correct Meaning of Characters write it as xu. Attached to the twelve-stroke section, which is incorrect; this has now been corrected.