Definition of "Palatal" :

noun: a semivowel produced with the tongue near the palate (like the initial sound in the English word yeast')

adjective: produced with the front of the tongue near or touching the hard palate (as y') or with the blade of the tongue near the hard palate (as ch' in chin' or j' in gin')

adjective: relating to or lying near the palate

"Palatal index."