A flatfish, esp. the common flounder, Pleuronectes Flesus.

Any of various flatfishes, as a sole, plaice, turbot, flounder, halibut, etc.

A small flatfish, Pleuronectes Flesus. In the U.S. applied to various other species of flatfish. Proverb: as flat as a flounder.

Apparently a name for certain flatfish; see quots.

(see quot. 1815).

a large flounder, Paralichthys californicus (family Bothidae), common off the coast of California and caught for sport and commercially as a food…