marbling means: Extramuscular fat, especially in beef, is a streak of fat that adds to meat’s taste and tenderness. The primary factor that determines a meat’s quality is marbling. (in Cooking Dictionary)

What else does marbling mean?

It is a mottling effect or streaking which resembles marble. (in Merlin Dictionary)

A process of giving an object the appearance of marble. (in Merlin Dictionary)

A decorative imitation of marble pattern printed on the pages edges and ends of books. (in Merlin Dictionary)

Flaks are thin, thin pieces of fat that can be found in cuts of meat. (in Merlin Dictionary)