seafood /ˈsiːfuːd/ noun2 •Food from the sea, including that derived from fish, shellfish, crustaceans, cephalopods, seaweed, algae, marine mammals, and other marine organisms.But most of all, they were jealous because these strangers feasted daily on great turtle, albacore and sail-fish, the sweetest of all seafoods. — 1929 •Food from any aquatic source, including not only salt water but also fresh water. formsseafoods