Definition of devil ray
: any of various very large rays (genera Manta and Mobula of the family Mobulidae) widely distributed in warm seas that have large, triangular, winglike pectoral fins and a pair of hornlike lobes near the mouth which are used to guide plankton and other small aquatic organisms into the mouth, that typically lack a stinger on the tail, and that reproduce viviparously producing one or two offspring at birth —called also devilfish — compare manta ray
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