Kays 267:23 :ܦܪܙܠܐ ܩܫܝܐ ܘܦܪܙܠܐ ܪܟܝ݂ܟܐ܂ ܘܗܢܕܘܝܐ ܗ݀ܘ ܕܡܬܐܡܪ ܒܘܠܐܕ‏ : hard iron, soft iron, and Indian (iron), the one called 'bulad'
See the entire entry for bwlˀd n.m. steel