fillet steaknoun [ C or U ]
/ˌfɪl.ɪt ˈsteɪk//ˌfɪl.ɪt ˈsteɪk/UKa piece of good-quality beef (= meat from a cow) cut from the middle part of a cow's back, or meat of this type in general:
lightly grilled fillet steaks
We can't afford to eat fillet steak every night.