Definition of "lung" []

• Either of two spongy, saclike respiratory organs in most vertebrates, occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen. (noun)
• A similar organ in some invertebrates, including spiders and terrestrial snails. (noun)
• At the top of (one's) lungs As loudly as one's voice will allow. (idiom)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I held my hand up to look and it was glistening with that bright red blood you see in lung shots."
• "Amniotic fluid is an important prognostic indicator because a critical phase in lung development occurs around 18 to 20 weeks of gestation."
• "The role and regulation of heme oxygenase in lung antioxidant defenses"