either of the two saclike respiratory organs in the thorax of humans and the higher vertebrates.

an analogous organ in certain invertebrates, as arachnids or terrestrial gastropods. ?

at the top of one's lungs

as loudly as possible; with full voice

The baby cried at the top of his lungs.

adjective

pectoral , pneumonic , pulmonary , pulmonic , respiratory , thoracic

noun

alveolus , bronchi , pleura