DeMundo 136:11 :ܡܬܬܙܝܥܢܘܬܐ ܐܝܬܝܝܬܐ ܒܚܘܕܪܐ ܘܒܟܪܟܐ‏ : constant, circular motion
See the entire entry for ˀīṯyāy adj. essential