[1] : The Collaborative International Dictionary of English v.0.48

shad \shad\ sha^d, n. sing.  pl. as. sceadda a kind of
   fish, akin to prov. g. schade; cf. ir.  gael. sgadan a
   herring, w. ysgadan herrings; all perhaps akin to e. skate a
   fish. zool.
   any one of several species of food fishes of the herring
   family. the american species alosa sapidissima formerly
   clupea sapidissima, which is abundant on the atlantic
   coast and ascends the larger rivers in spring to spawn, is an
   important market fish. the european allice shad, or alose
   alosa alosa formerly clupea alosa, and the twaite shad
   alosa finta formerly clupea finta, are less important
   species. written also chad.
   1913 webster

   note: the name is loosely applied, also, to several other
         fishes, as the gizzard shad see under gizzard,
         called also mud shad, white-eyed shad, and winter
         shad.
         1913 webster

   hardboaded shad, or yellow-tailed shad, the menhaden.

   hickory shad, or tailor shad, the mattowacca.

   long-boned shad, one of several species of important food
      fishes of the bermudas and the west indies, of the genus
      gerres.

   shad bush bot., a name given to the north american shrubs
      or small trees of the rosaceous genus amelanchier
      amelanchier canadensis, and amelanchier alnifolia.
      their white racemose blossoms open in april or may, when
      the shad appear, and the edible berries pomes ripen in
      june or july, whence they are called juneberries. the
      plant is also called service tree, and juneberry.

   shad frog, an american spotted frog rana halecina; --
      so called because it usually appears at the time when the
      shad begin to run in the rivers.

   trout shad, the squeteague.

   white shad, the common shad.
      1913 webster
see also:
alosa sapidissima clupea sapidissima alosa alosa clupea alosa alosa finta clupea finta 
chad gizzard mud shad white-eyed shad winter shad 
hardboaded shad yellow-tailed shad hickory shad tailor shad mattowacca 
long-boned shad gerres shad bush amelanchier amelanchier canadensis 
amelanchier alnifolia juneberries service tree juneberry shad frog 
rana halecina trout shad white shad 

Shad >> S Words
Shad, definition of term: Shad
shad_pag1.html

Gizzard Shad >> G Words
Gizzard Shad, definition of term: Gizzard Shad
gizzard+shad_pag1.html