UK: /ˈɒptɪkəl kˈæɹɪktɐ ɹˌɛkəɡnˈɪʃən/ US: /ˈɑptɪkəɫ ˈkɛɹɪktɝ ˌɹɛkəɡˈnɪʃən/, /ˌɹɛkɪɡˈnɪʃən/
n. ljóslestur, myndlestur, stafgreining