phys·ic 
(fĭzĭk)
(fĭzĭk)n.
1. A medicine or drug, especially a cathartic.
2. Archaic The art or profession of medicine.
tr.v. phys·icked, phys·ick·ing, phys·ics
1. To act on as a cathartic.
2. To cure or heal.
3. To treat with or as if with medicine.
[Middle English phisik, from Old French fisique, medical science, natural science, from Latin, natural science, from Greek phusikē, feminine of phusikos, of nature, from phusis, nature; see bheuə- in the Appendix of Indo-European roots.]