The smaw thairm is a thairm, an a pairt o mony leevin beins. It lees atween the painch an the lairge thairm. In humans ower 5 year auld, a smaw thraim micht be five tae sax metre lang. It is langer nor the lairge thairms. But, as its diameter is less, its name is the smaw thairms.