From ܡܵܘܣܸܦ (māwsip, “to add”) + -ܢܐ (-ānā, the adjectival ending).
ܡܵܘܣܦܵܢܵܐ • (māwspānā) (feminine ܡܵܘܣܦܵܢܝܼܬܵܐ (māwspānītā), plural ܡܵܘܣܦܵܢܹ̈ܐ (māwspānē))