Webster's English Dictionary

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alveolus

al.ve.o.lus \al-ve--*-l*s\ \-.li-, -(.)le-\ n or al.ve.o.li [NL, fr. L, 
   dim. of alveus cavity, hollow, fr. alvus belly; akin to] pl  ON hvannjo-li 
   stalk of angelica, Gk aulos, a reed instrument 1: a small cavity or pit : 
   as  1a: a socket for a tooth  1b: an air cell of the lungs  1c: an acinus 
   of a compound gland  1d: a cell or compartment of a honeycomb  2: 
   TEETHRIDGE