mackerel

1. Certain smaller edible fish, principally true mackerel and Spanish mackerel in family Scombridae, often speckled, (countable, uncountable)
2. Typically Scomber scombrus in the British isles. (countable, uncountable)
3. A true mackerel, any fish of tribe Scombrini (Scomber spp., Rastrelliger spp.) (countable, uncountable)
4. Certain other similar small fish in families Carangidae, Gempylidae, and Hexagrammidae. (countable, uncountable)
5. A regular pattern, similar to fish scales, of undulating small clouds with sky visible between them. (countable, uncountable) · a mackerel sky

Plural mackerel