Webster's English Dictionary

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shad

shad \'shad\ n or shad [(assumed) ME, fr. OE sceadd; akin to L scate-re to 
   bubble] pl  : any of several clupeid fishes (genus Alosa) that differ from 
   the t ypical herrings in having a relatively deep body and in being 
   anadromous and that are extremely important food fishes of Europe and No. 
   America