cacuminal

adj.
Articulated with the tip of the tongue turned back and up toward the roof of the mouth; retroflex.

[From Latin cacūmen, cacūmin-, summit, point.]

IN BRIEF: adj. - Pronounced with the tip of the tongue turned back toward the hard palate.

Tutor's tip: This word was used in the 2006 Scripps National Spelling Bee finals.

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The adjective has one meaning:

Meaning #1: (linguistics) pronounced with the tip of the tongue turned back toward the hard palate
  Synonym: retroflex

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