Ankyrism is a medical term used to describe the dilation or ballooning of a blood vessel in the brain. The correct spelling of the word is "aneurysm", pronounced as /ˈæn.jə.rɪ.zəm/. The phonetic transcription indicates that the stress falls on the second syllable "jə". The "aneu" is pronounced as "an-yoo" and the "rys" is pronounced as "ri-z". It is essential to use correct spelling and pronunciation of medical terms to ensure effective communication between healthcare professionals and patients.