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Pronunciation varies by accent · noun
bluefin tuna, any of a number of types of tuna characterised by their blue fins..
Use bluefin when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Bluefin means bluefin tuna, any of a number of types of tuna characterised by their blue fins..
Common synonyms include horse mackerel, bluefin tuna, thunnus thynnus.
The opposite depends on the specific sense.
Use bluefin where its definition matches the intended context.
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