IshGen 27:8 :ܕܠܐ ܬܬܦܠܗܕ ܡ݂ܢ ܚܘܪܘܬܐ ܣܓܝܐܬܐ ܕܢܗ݀ܝܪ̈ܐ ܕܒܗ ܪܕܝܢ‏ : so that they would not be disturbed by the great brightness of the luminaries moving in it
See the entire entry for ḥewwārū, ḥewwārūṯā n.f. whiteness