Definition of pakhtun:
(n) :
Alternative form of Pashtun. [A member of the Pashtun ethnic group, or of a Pashtun tribe.]
(adj) :
Alternative form of Pashtun. [Of or relating to the Pashtuns (a segmentary-lineage ethnic group currently numbering some 50 million people, which is the largest ethnic group in Afghanistan and the second largest in Pakistan), or to their culture.]