al ‧ ve ‧ o ‧ lar /ˌælviˈəʊlə◂, ælˈviːələ $ ælˈviːələr/ BrE AmE noun [countable] technical
[ Date: 1700-1800 ; Origin: alveolus 'hollow part in which a tooth is fastened' (17-21 centuries) , from Latin , from alveus 'hollow place' ]
a ↑ consonant sound such as /t/ or /d/ that you make by putting the end of your tongue behind your upper front teeth