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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: zoology) A large sting ray (Dasybatis, or trygon, Sayi) native of the southern united states. It is destitute of large spines on the body and tail.

A large sting ray (Rhinoptera bonasus, or R. Quadriloba) of the atlantic coast of the united states. Its snout appears to be four-lobed when viewed in front, whence it is also called cow-nosed ray.