A similar organ in some invertebrates, including spiders and terrestrial snails.
from The American Heritage Dictionary of the English Language, 4th Edition
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.
from The American Heritage Dictionary of the English Language, 4th Edition
One of the usually paired compound saccular thoracic organs that constitute the basic respiratory organ of air-breathing vertebrates.
from Free Scrabble Dictionary
Any of various respiratory organs of invertebrates.
from Free Scrabble Dictionary
A device enabling individuals abandoning a submarine to rise to the surface.
from Free Scrabble Dictionary
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