adjective Ichthyology.
having the air bladder closed off from the mouth.
Compare physostomous.

1885–90; < Neo-Latin Physoclist(i) genus name (< Greek phȳso- physo- + kleistoí, plural of kleistós shut, verbid of kleíein to shut) + -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
physoclistous (ˌfaɪsəʊˈklɪstəs)
Compare physostomous (of fishes) having an air bladder that is not connected to the alimentary canal
[C19: from Greek phusa bladder + -clistous, from kleistos closed]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These physoclistous fish must gulp atmospheric air to initiate the inflation process.
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