labial/ˈleɪbɪəl; `lebɪəl/ adj1 of the lips 唇的.2 (phonetics 语音) made with the lips 唇音的 labial sounds, eg / m, p, v/ 唇音（如 / m/、 /p/、 /v/）. labial, n (phonetics 语音) sound made with the lips 唇音.
牛津英汉双解词典