plural mackerel or mackerels
Definition of mackerel
1
: a scombroid fish (Scomber scombrus of the family Scombridae) of the North Atlantic that is green above with dark blue bars and silvery below and is a commercially important food fish
2
: any of various fishes (such as the wahoo and king mackerel) in the same family as the mackerel especially when distinguished from the related bonito or tuna by a comparatively smaller size
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Merriam-Webster unabridged
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Time Traveler for mackerel
The first known use of mackerel was in the 14th century
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