n. (Zool.) (a) A large sting ray (Dasybatis Sayi, or Trygon Sayi) native of the Southern United States. It is destitute of large spines on the body and tail. (b) A large sting ray (Rhinoptera bonasus, or Rhinoptera 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. [ 1913 Webster ]