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Definition of: air sac

1. Ornithol. One of the membranous sacs filled with air located in different parts of the body in birds, often extending through the bones and communicating with the lungs.
2. Entomol. Any of the large, thin-walled structures connected to the tracheal system in some insects.
3. An alveolus of the lungs.

Most often used phrases:

air sac system
air sac s
air sac similar
cervical air sac
inflatable air sac
large air sac
respiratory air sac
clavicular air sac
air sac alveoli
alveoli air sac
air sac ulitis
facial air sac
posterior air sac
air sac systems
small air sac

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Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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