IshGen 25:5 :ܘܐܝܟ ܐܣܦܝܪܐ ܡܕܡ ܦܪܚܬ ܠܥܠ ܘܬܡܢ ܐܫܬܛܚܬ ܘܗܘ݂ܬ ܐܝܟ ܡܕܡ ܫܕܬܐ‏ : like a kind of sphere it flew up and flattened itslef out there and become a kind of base
See the entire entry for šṭḥ vb. to spread out flat