alveolar ridge
noun
1
: the bony ridge or raised thickened border of the upper or lower jaw that contains the sockets of the teeth : alveolar process
It is common for many of the teeth to be displaced from the alveolar ridge into the palate.—M. A. Kettle et al.
2
: the gum-covered ridge of bone behind the teeth in the upper jaw
Both sounds are fricatives made by creating a partial obstruction between the tongue and the alveolar ridge …—Cognitive Science
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Merriam-Webster unabridged
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