[pol.lack] or pol.lock n, pl pollack or pollock [ME poullok, perh. fr. ScotGael pollag or Ir pollog] (15c) 1: a commercially important north Atlantic food fish (Pollachius virens) related to and resembling the cods but darker
2: a commercially important northern Pacific food fish (Theragra chalcogramma) of the cod family that closely resembles the pollack--called also walleye pollack