D defs.my
Entry 2 senses Webster, 1913

Ictus

/ĭkʹtəs/ · Ic·tus · IPA /ˈɪktəs/
01 n. The stress of voice laid upon accented syllable of a word. Cf. Arsis.
  1. 1.
    The stress of voice laid upon accented syllable of a word. Cf. Arsis.(Pros.) See: Arsis
  2. 2.
    A stroke or blow, as in a sunstroke, the sting of an insect, pulsation of an artery, etc.(Med.)