Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
systole is a noun meaning "the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery". It carries one recorded sense.
the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery
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 systole come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.