ca·cu·mi·nal /kæˈkjumənḷ, kə-/
  Ca·cu·mi·nal a.  Philol. Pertaining to the top of the palate; cerebral; -- applied to certain consonants; as, cacuminal (or cerebral) letters.
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  cacuminal
       adj : pronounced with the tip of the tongue turned back toward the
             hard palate [syn: retroflex]