ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
: either of two freshwater relict fishes that are the only surviving members of the family Polyodontidae:
a. : an American fish ( Polyodon spathula ) found in the Mississippi river and its tributaries, having a long spatula-shaped snout, smooth skin, heterocercal tail, and long gill rakers, attaining a length of four feet or more, and having flesh which though coarse is used as food and roe that is made into caviar — called also duckbill
b. : a closely related Chinese fish ( Psephurus gladius ) having a narrower snout
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