alveoli

noun

A small cavity or pit.
An anatomical structure that has the form of a hollow cavity, as:

Similar Words

alveolars alveolitis alveolus /ælˈviələs/ alveolar /æl.viː.ˈəʊ.lə/ aardwolves /ˈɑɹdˌwʊlvz/ absolve /əbˈzɒlv/ absolved absolves