| air cell [`er ´sel] ELECTRONICS A cell in which depolarization at the positive electrode is accomplished chemically by reduction of the oxygen in the air. MECHANICAL ENGINEERING A small auxiliary combustion chamber used to promote turbulence and improve combustion in certain types of diesel engines. ZOOLOGY A cavity or receptacle for air such as an alveolus, an air sac in birds, or a dilation of the trachea in insects. |