flatfish Meaning, Definition & Usage

  1. noun sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets
  2. noun any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side

WordNet

Flat"fish` noun
Definitions
  1. (Zoöl.) Any fish of the family Pleuronectidæ; esp., the winter flounder (Pleuronectes Americanus). The flatfishes have the body flattened, swim on the side, and have eyes on one side, as the flounder, turbot, and halibut. See Flounder.

Webster 1913