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| lung [ lung ] (plural lungs) |
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1. respiratory organ in vertebrates: in air-breathing vertebrate animals, either of the paired spongy respiratory organs, situated inside the rib cage, that transfer oxygen into the blood and remove carbon dioxide from it
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often used before a noun
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2. respiratory organ in invertebrates: a respiratory organ found in invertebrate animals, especially the highly vascular region of the mantle cavity in some terrestrial snails
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| [ Old English, < Indo-European, "light"] |
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 lung·ful noun |
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at the top of your lungs extremely loudly (informal)
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