ApocDan.52.29 :ܘܓܘ̈ܢܚܐ ܪܘܪ̈ܒܐ ܢܗܘܘܢ ܒܬܗܘ̈ܡܐ ܕܐܪܥܐ‏ : there shall be great shockwaves in the subterranean waters
See the entire entry for thōm, thōmā n.m. abyss