מְסַמְתָּא, (סוּם) one of the marked-off tiers or settles of the altar (v. Midd. III, 1). Targ. Ez. XLIII, 14; 17 (ed. Lag. מְסִימְ׳ a. מְסַמְ׳; ed. Wil. first time מְסַתְּמָתָא, Ar. מסמסתא; corr. acc.; h. text עזרה).