plural noun
Phy·sos·to·mi | \fīˈsästəˌmī\

Definition of Physostomi 

in some classifications

: an order of teleost fishes comprising those in which the air bladder when present is joined with the esophagus by an open duct and the ventral fins when present are abdominal, including the salmons, herrings, carps, catfishes, and others, and being more or less nearly equivalent to Isospondyli — compare malacopterygii, physoclisti

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History and Etymology for Physostomi

New Latin, from phys- + -stomi

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