from
The Collaborative International Dictionary of English v.0.48
Chub \Chub\, n. [This word seems to signify a large or thick
fish. Cf. Sw. kubb a short and thick piece of wood, and perh.
F. chabot chub.] (Zool.)
A species to fresh-water fish of the {Cyprinid[ae]} or Carp
family. The common European species is {Leuciscus cephalus};
the cheven. In America the name is applied to various fishes
of the same family, of the genera {Semotilus}, {Squalius},
{Ceratichthys}, etc., and locally to several very different
fishes, as the {tautog}, {black bass}, etc.
[1913 Webster]
{Chub mackerel} (Zool.), a species of mackerel ({Scomber
colias}) in some years found in abundance on the Atlantic
coast, but absent in others; -- called also {bull
mackerel}, {thimble-eye}, and {big-eye mackerel}.
{Chub sucker} (Zool.), a fresh-water fish of the United
States ({Erimyzon sucetta}); -- called also {creekfish}.
[1913 Webster]