<p><strong>Noun</strong></p><ul><li>Mackerel, plural (especially collectively) mackerel (especially referring to two or more kinds or species) mackerels.</li><li>A food fish, Scomber scombrus, of the North Atlantic, having wavy cross markings on the back.</li><li>Spanish mackerel.</li><li>Any of various similar fishes, as the Atka mackerel.</li></ul>