What is patsun? Define it.

Your question is not clear. If you are asking about the Pashtun, then the answer is:
The Pashtun people, historically known as Afghans, and Pathans in Hindi-Urdu, are an Indo-European ethnicity from the subgroup of Eastern Iranians, with populations primarily in Afghanistan and northwestern and western parts of Pakistan.

However, if you are asking about the patsan plant, then the answer is:

Patsan is a plant from which fibres are obtained which are used to make cloths, ropes, bags etc.