ictus (n.)youdaoicibaDictYouDict[ictus 词源字典]
verse stress, 1752, from Latin ictus "a blow, stroke, thrust," of voices "a beat, impulse, stress," from icere "to strike, hit," related to iacere "to throw" (see jet (v.)).[ictus etymology, ictus origin, 英语词源]