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XF is a letter grade used at some U.S. colleges, to denote either students who withdraw from a course after the refund period has lapsed [1][2] or who are caught performing acts of academic dishonesty.
Xen- (prefix): Foreign or other. As in: 1  Xenoantigen -- An antigen that is found in more than one species.  Xenograft -- A surgical graft of tissue from one species to an unlike species, genus or family.