i Register
In some senses, muttonfish is marked as US. Watch for register when choosing this word.
noun
Any of several Atlantic and Caribbean fishes which are said to taste of mutton, especially a mutton snapper (Lutjanus analis), an ocean pout (Macrozoarces americanus), or an Irish pompano (Diapterus auratus).
Any of several edible molluscs of the genus Haliotis; an abalone.
Some mornings when the tide was right out we went onto the reef with screwdrivers to prise off abalone, which we called muttonfish.