Coronals are consonants articulated with the tip or the front part of the tongue against the upper teeth, the upper gum (the alveolar ridge) or the part of the hard palate just behind it. The term covers a wide range of pronunciations, including 
dental, 
alveolar and 
postalveolar[?] consonants.
 
All Wikipedia text 
is available under the 
terms of the GNU Free Documentation License