pneumatic duct

noun

the duct joining the air bladder and alimentary canal of a physostomous fish.

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Based on the Random House Dictionary, © Random House, Inc. 2016.
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Historical Examples

The absence of a pneumatic duct in the Physoclisti would appear to be due to a post-larval atrophy.

The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour
He also believed that certain species produced a noise by forcing the gas from the air-bladder through a pneumatic duct.

A Guide to the Study of Fishes, Volume 1 (of 2) David Starr Jordan

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