tilefish means: The low-fat Atlantic fish has delicate flavors and a tender, firm flesh. You can buy it fresh or frozen in fillets and steaks. They can be used in almost any type of cooking. (in Cooking Dictionary)

What else does tilefish mean?

One of many chiefly marine fishes in the family Malacanthidae. Lopholatilus chamaeleonticeps, A reddish-blue fish that eats deep Atlantic water. It has a fleshy pouch on its nape, small yellow spots at the fins and upper sides. (in Merlin Dictionary)