cacuminalEnglishOxford New American Dictionarycacuminal /kəˈkyo͞omən(ə)l, kəˈkjumən(ə)l / ▸ adjective Phonetics another term for retroflex. – ORIGIN mid 19th century : from Latin cacuminare ‘make pointed’ (from cacumen, cacumin- ‘top, summit’) + -al.