haddock

n. type of edible fish found in the North Atlantic (member of the cod family)

The haddock or offshore hake is a marine fish distributed on both sides of the North Atlantic. Haddock is a popular food fish, widely fished commercially. The haddock is easily recognised by a black lateral line running along its white side, not to be confused with pollock which has the reverse, ie white line on black side, and a distinctive dark blotch above the pectoral fin, often described as a "thumbprint" or even the "Devil's thumbprint" or "St. Peter's mark".
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Noun
1. lean white flesh of fish similar to but smaller than cod; usually baked or poached or as fillets sauteed or fried
(hypernym) fish
(hyponym) finnan haddie, finnan haddock, finnan, smoked haddock
(part-holonym) Melanogrammus aeglefinus
2. important food fish on both sides of the Atlantic; related to cod but usually smaller
(synonym) Melanogrammus aeglefinus
(hypernym) gadoid, gadoid fish
(member-holonym) Melanogrammus, genus Melanogrammus

n. smoked haddock

(n.)
A marine food fish (Melanogrammus aeglefinus), allied to the cod, inhabiting the northern coasts of Europe and America. It has a dark lateral line and a black spot on each side of the body, just back of the gills. Galled also haddie, and dickie.