D defs.my
Entry 2 senses Webster, 1913

Diastole

/dī-ăs'-təl-ēˌ/ · Di·as·to·le · IPA /daɪˈæstəli/
01 n. The rhythmical expansion or dilatation of the heart and arteries; -- correlative to systole, or contraction.
  1. 1.
    The rhythmical expansion or dilatation of the heart and arteries; -- correlative to systole, or contraction.(Physiol.)
  2. 2.
    A figure by which a syllable naturally short is made long.(Gram.)