Rhythmical stress

• A sudden occurrence (or recurrence) of a disease
• Stress
• I'll get cut treated, the source of some stress
• Beat for Byron
• Poetic stress
• Metrical accent
• Rhythmic stress

Wikipedia Word definitions in Wikipedia
Ictus may refer to:

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ictus \Ic"tus\, n. [L., fr. icere, ictum, to strike.] (Pros.) The stress of voice laid upon accented syllable of a word. Cf. Arsis . (Med.) A stroke or blow, as in a sunstroke, the sting of an insect, pulsation of an artery, etc.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
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.)).