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Definition diastole


From Ancient Greek διαστολή (diastolḗ, “separation, drawing asunder”), from διά (diá, “apart”) + στέλλειν (stéllein, “send”).


diastole (usually uncountable, plural diastoles)

  1. (chiefly uncountable, physiology) The phase or process of relaxation and dilation of the heart chambers, between contractions, during which they fill with blood; an instance of the process.
  2. (uncountable, prosody) The lengthening of a vowel or syllable beyond its typical length.
  3. (Greek grammar) The hypodiastole, a textual or punctuation mark formerly used to disambiguate homonyms in Greek.

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