Meaning

noun the lean flesh of a cod-like fish of North Atlantic waters

noun large edible marine fish of northern coastal waters; related to cod

noun elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth

originEarly 17th century; of unknown origin. Probably an alteration of torsk or tusk, a codlike fish, from Norwegian tosk, torsk; Old Norse thorskr, codfish.

Etymology from Wiktionary, CC BY-SA 3.0