Webster’s Revised Unabridged Dictionary · 1913
Systole
Sys′to·le (sĭs′tē·l̇), n. [NL., fr. Gr. συστολή, fr. συστέλλειν to contract; σύν with + στέλλειν to set, place.] 1. (Gram.) The shortening of the long syllable.
2. (Physiol.) The contraction of the heart and arteries by which the blood is forced onward and the circulation kept up; — correlative to diastole.