flatfish

nouns

sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets
is a type of (narrower)
flesh of fish from the sea used as food
any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side
is a member of
flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes
is a type of (narrower)
a teleost fish with fins that are supported by sharp inflexible rays