lung 
/ˈlʌŋ/ noun
plural lungs /ˈlʌŋ/ noun [count] : either one of the two organs that people and animals use to breathe air
▪ He filled his lungs with the clean. fresh air. ▪ lung disease/cancer ▪ She shouted at the top of her lungs. [=she shouted as loudly as possible] — see picture at human
▪ He filled his lungs with the clean. fresh air. ▪ lung disease/cancer ▪ She shouted at the top of her lungs. [=she shouted as loudly as possible] — see picture at human
