say it: dahy-A-stuh-lee
diastole is a noun meaning "the widening of the chambers of the heart between two contractions when the chambers fill with blood". It carries one recorded sense.
the widening of the chambers of the heart between two contractions when the chambers fill with blood
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 diastole come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.