General English

General Science

  • noun a chronic lung disease characterised by enlargement and loss of elasticity of the air spaces, resulting in breathing difficulties
  • noun an unusual enlargement of an organ or body tissue caused by retention of air or other gas


  • noun a condition in which the walls of the alveoli of the lungs break down, reducing the surface available for gas exchange and resulting in a lower oxygen level in the blood and shortness of breath. It can be caused by smoking, living in a polluted environment, old age, asthma or whooping cough.