Si Collection, Middle Volume Radical: Fire (huǒ) Ao Kangxi Strokes: 19 Page 686, Entry 22 Collected Rhymes (Jiyun) and Correct Rhymes (Zhengyun) state the pronunciation is ao. Jade Chapters (Yupian): To warm. Collected Rhymes (Jiyun): To bury in hot ashes to cook. History of the Former Han (Qian Hanshu), Biography of Yang Yun: To boil sheep and roast lamb. Commentary by Shigu says: To roast meat after removing the fur. This is what is now called ao. Ao is pronounced ao (rising tone). Collected Rhymes (Jiyun): Sometimes written as a variant form. According to Broad Rhymes (Guangyun), Categorized Compendium (Leipian), and Rhyme Collection (Yunhui), it is written differently as a variant.