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The Collaborative International Dictionary of English v.0.48:

Physostomi \Phy*sos"to*mi\ (f[i^]*s[o^]s"t[-o]*m[imac]), prop. n. pl. [NL., fr. Gr. fy^sa a bellows + sto`ma mouth.] (Zool.) 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. [1913 Webster]