Dictionary.com
Thesaurus.com

chub

American  
[chuhb] / tʃʌb /

noun

plural

chub,

plural

chubs
  1. a common freshwater fish, Leuciscus cephalus, of European waters, having a thick, fusiform body.

  2. any of various related fishes.

  3. any of several unrelated American fishes, especially the tautog and whitefishes of the genus Coregonus, of the Great Lakes.


chub British  
/ tʃʌb /

noun

  1. a common European freshwater cyprinid game fish, Leuciscus (or Squalius ) cephalus, having a cylindrical dark greenish body

  2. any of various North American fishes, esp certain whitefishes and minnows

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of chub

1400–50; late Middle English chubbe, of obscure origin