CACUMINAL
cacuminal, retroflex
(adjective) pronounced with the tip of the tongue turned back toward the hard palate
Source: WordNet® 3.1
Etymology
Adjective
cacuminal (comparative more cacuminal, superlative most cacuminal)
Pertaining to a point, top, or crown.
(linguistics, phonology) Pronounced using a retroflexed tongue.
Noun
cacuminal (plural cacuminals)
(linguistics, phonology) A sound pronounced using a retroflexed tongue.
Source: Wiktionary
Ca*cu"mi*nal, a. Etym: [L. cacumen, cacuminis, the top, point.]
(Philol.)
Definition: Pertaining to the top of the palate; cerebral; -- applied to
certain consonants; as, cacuminal (or cerebral) letters.
Source: Webster’s Unabridged Dictionary 1913 Edition