Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
mouthbreeder is a noun meaning "any of various fishes that carry their eggs and their young in their mouths". It carries one recorded sense.
any of various fishes that carry their eggs and their young in their mouths
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 mouthbreeder come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.