Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
midriff is a noun meaning "the middle area of the human torso (usually in front)". It carries 2 recorded senses.
the middle area of the human torso (usually in front)
“young American women believe that a bare midriff is fashionable”
(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
anatomy
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 midriff come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.