P Ez41:15 :ܘܒܣܬܪܗ ܘܬܝ̈ܟܘܗܝ ܡܟܐ ܘܡܟܐ ܡܐܐ ܐ̈ܡܝܢ‏ : its back side and parapets: a hundred cubits on either side
See the entire entry for bestar, bestrā n.m. back part, back

P Ez41:15 :ܘܒܣܬܪܗ ܘܬܝ̈ܟܘܗܝ ܡܟܐ ܘܡܟܐ ܡܐܐ ܐ̈ܡܝܢ‏ : its back side and parapets: a hundred cubits on either side
See the entire entry for mekkā adv. from here