Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
groundfish is a noun meaning "fish that live on the sea bottom (particularly the commercially important gadoid fish like cod and haddock, or flatfish like flounder)". It carries one recorded sense.
fish that live on the sea bottom (particularly the commercially important gadoid fish like cod and haddock, or flatfish like flounder)
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 groundfish come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.