Alveolar ridge
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An alveolar ridge is one of the two jaw ridges either on the roof of the mouth between the superior (= upper) teeth and the hard palate or on the bottom of the mouth behind the inferior (= lower) teeth.
The alveolar ridges are called that way because they have the alveoli (sockets, sing.: alveolus) of the teeth.
Many languages have consonants that are articulated with the tongue on (touching) or close to (without touching) the superior alveolar ridge. See alveolar consonant.
See also: List of phonetic topics