Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
premenstrual is an adjective meaning "of or relating to or occurring during the period just before menstruation". It carries one recorded sense.
of or relating to or occurring during the period just before menstruation
Definitions, synonyms and semantic relations for premenstrual come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.