
• (n. pl.) An order of fishes in which the air bladder is provided with a duct, and the ventral fins, when present, are abdominal. It includes the salmons, herrings, carps, catfishes, and others.
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http://thinkexist.com/dictionary/meaning/physostomi/
Phy·sos'to·mi noun plural [ New Latin , from Greek ... a bellows + ... mouth.]
(Zoology) An order of fishes in which the air bladder is provided with a duct, and the ventral fins, when present, are abdominal. It includes the salmons, herrings, carps, catfishes, and others.
Found on
http://www.encyclo.co.uk/webster/P/81

physostome, physostomi, physostomatous, physostomous Fish that have a pneumatic duct leading from the air bladder to some part of the alimentary canal (usually the esophagus); they include members of a number of suborders and the name is no longer used in systematic classification. —A Dictionary of Zoology by A. W. Leftwich (London: Constabl...
Found on
http://www.wordinfo.info/words/index/info/view_unit/1662/
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