noun
Usage: usually capitalized S
1. : any of several mackerels of the genus Scomberomorus: as
a. : a mackerel ( S. maculatus ) that is bluish above with oval brown spots on the sides, is found during the warmer months off the American Atlantic coast from Cape Ann to Brazil, and often weighs six to ten pounds
b. : a related but unspotted mackerel ( S. concolor ) occurring on the Mexican and Southern California coast
c. : a large mackerel ( S. commersoni ) that is widespread in the tropical Indo-Pacific, attains a length of six feet, and weighs over 100 pounds
2. West : jack mackerel a
3. : chub mackerel