Mao Collection, Upper Volume Radical: Heart (xīn) Strokes in Kangxi Dictionary: 10 Page 383, Entry 24 In Broad Rhymes (Guangyun), Rhyme Collections (Jiyun), Rhyme Meetings (Yunhui), and Correct Rhymes (Zhengyun), it is pronounced lao (rising tone). Cao lao, meaning a troubled heart.