GregNysLR.205.29 :ܢܘܪܐ ܗ݀ܝ ܕܒܥܘܒܗ ܕܐܬܝܪ ܟܡܝܢܐ‏ : that fire hiding in wait in the recesses of the aether
See the entire entry for ˀatīr n.f. the aether