IshIsa 54:22 :ܣܦܝܠܐ܃ ܓܘܢ ܫܡܝܐ܂ ܗܢܘ܂ ܠܙܘܪܕ‏ : s' is the color of the sky, i.e., lapis lazuli
See the entire entry for lāˀzward n.m. lapis lazuli