Webster’s Revised Unabridged Dictionary · 1913
Systole
Sys′to·le, n. (Physiol. & Biol.) The contraction of the heart and arteries by which the blood is forced onward and the circulation kept up; also, the contraction of a rhythmically pulsating contractile vacuole; — correlative to diastole. — Sys·tol′ic (#), a.