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n. Physiology The normal rhythmically occurring relaxation and dilatation of the heart chambers, especially the ventricles, during which they fill with blood.

n. The lengthening of a normally short syllable in Greek and Latin verse.

n. 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.

n. The lengthening of a vowel or syllable beyond its typical length.

n. The rhythmical expansion or dilatation of the heart and arteries; -- correlative to systole, or contraction.

n. A figure by which a syllable naturally short is made long.

n. The normal rhythmical dilatation or relaxation of the heart or other blood-vessel, which alternates with systole or contraction, the two movements together constituting pulsation or beating: as, auricular diastole; ventricular diastole.

n. The period or length of time during which a rhythmically pulsating vessel is relaxed or dilated; the time-interval which alternates with systole.

n. In Greek grammar, a mark similar in position and shape to a comma, but originally semicircular in form, used to indicate the correct separation of words, and guard against a false division, such as might pervert the sense.

n. In ancient prosody, lengthening or protraction of a syllable regularly short; especially, protraction of a syllable preceding a pause or taking the ictus: as

n. the widening of the chambers of the heart between two contractions when the chambers fill with blood

"This occurs when the lower chambers of the heart -- the ventricles -- become stiff and cannot fully relax during the pumping stage called diastole, when the ventricles fill with blood."

systole   

beat    heartbeat    pulsation    pulse   

diastolic   

systole    depolarization    dilatation    tachycardia    dermis    septum    vocalic    overpricing    remodeling    vasoconstriction