D defs.my
Entry 2 senses Webster, 1913

Arsis

/(är"sĭs)/ · Ar·sis · IPA /ˈɑː(ɹ)sɪs/
01 n. That part of a foot where the ictus is put, or which is distinguished from the rest (known as the thesis) of the foot by a greater stress o…
  1. 1.
    That part of a foot where the ictus is put, or which is distinguished from the rest (known as the thesis) of the foot by a greater stress of voice.(Pros.)
  2. 2.
    The elevation of the hand, or that part of the bar at which it is raised, in beating time; the weak or unaccented part of the bar; -- opposed to thesis.(Mus.)