cacuminal /kəˈkjuːmənəl/adjective 2noun 1forms 3 adjective2 •Pertaining to a point, top, or crown. •(old-fashioned) Pronounced using a concave or retroflexed tongue; occasionally palatal sounds more generally./L/ and /N/, slightly more cacuminal than the alveolar series, are very rare, and occur only in word-final position. — 1942 noun1 •(old-fashioned) A sound pronounced using a retroflexed tongue. formscacuminals · more cacuminal · most cacuminal