Alveolar ridge

An alveolar ridge (also known as the alveolar margin) is one of the two jaw ridges either on the roof of the mouth between the upper teeth and the hard palate or on the bottom of the mouth behind the lower teeth. The alveolar ridges contain the sockets (alveoli) of the teeth. You can touch their shapes by moving your tongue in the area right above or beneath the teeth sockets. Its surface is covered with little ridges. You can only see these with a mirror small enough to go inside your mouth. Sounds made with the tongue touching the alveolar ridge while speaking are called alveolar. Alveolar consonants are, for instance, [t], [d], [s], [z], [n], [l] like in the words time, dragon, superman, zeal, nasty and lollipop. When pronouncing these sounds you can feel your tongue touching ([t], [d], [n]), or nearly touching ([s], [z]) the upper alveolar ridge which can also be referred to as gum ridge.
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Alveolar /al·ve·o·lar/ [L. alveolaris ] pertaining to an alveolus. al·ve·o·lar adj. Relating to an alveolus. [more]Alveolar ridge - Community and Resources

Noun
1. a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth
(synonym) gum ridge, alveolar process
(hypernym) process, outgrowth, appendage
(part-holonym) jaw
(part-meronym) tooth socket, alveolus

PROCESSO ALVEOLARE. ARCATA ALVEOLARE