Definition of yellowtail
: any of various fishes having a yellow or yellowish tail: such asa : any of several carangid fishes (genus Seriola); especially : a food and sport fish (S. lalandi) of the Pacific and Indian oceans having a yellow stripe along each side of the bodyb : silver perch ac : a snapper (Ocyurus chrysurus) that is a sport and food fish found from Massachusetts to Brazil and is olive to bluish above with yellow spots and a broad yellow stripe along each side of the body —called also yellowtail snapper
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