say it: FLAT-fish
flatfish is a noun meaning "sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets". It carries 2 recorded senses.
sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets
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
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for flatfish come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.