Definition of ictus noun from the Oxford Advanced Learner's Dictionary

 

ictus

 noun
noun
BrE BrE//ˈɪktəs//
 
; NAmE NAmE//ˈɪktəs//
 
(pl. ictus, ictuses)(specialist)
 
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a beat or syllable that is given stronger emphasis than others as a part of a rhythm in poetry Word Origin early 18th cent. (denoting the beat of the pulse): from Latin, literally ‘blow’, from icere ‘to strike’.
See the Oxford Advanced American Dictionary entry: ictus