What does the word flook mean?

Definition:

A flook is a fluke, especially a flatfish such as a flounder.

Examples:

-"The flook was the first fish I caught on my new fishing rod."

-"I love to eat flooks, especially when they're fried."

-"The most common type of flook in this area is the winter flounder."

-"Flook is a Scottish and Northern English word for flounder."