Webster's English Dictionary

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mackerel

mack.er.el \'mak-(*-)r*l\ n or mackerel or mackerels [ME makerel, fr. OF] 
   pl  1: a fish (Scomber scombrus) of the No. Atlantic that is green above  
   with dark blue bars and silvery below, reaches a length of about 18 inches, 
   and is one of the most important food fishes 2: a fish of the suborder 
   (Scombroidea) to which the common mackerel belong s; esp : a comparatively 
   small member of this group as distinguished from a bonito or tuna