noun

• (archaic, countable) A medicine or drug, especially a cathartic or purgative.
  "Harke yee Lords, you ſee I haue giuen her Phiſicke, / And you muſt needs beſtovv her Funerall, […]"
• (archaic, uncountable) The art or profession of healing disease; medicine.
  "...and thus draw out all the unwholesome Air and Stench, which does more harm than any Physick can repair."
• (archaic, uncountable) Natural philosophy; physics.
  "When I left Mr. Bates, I went down to my Father; where, by the Aſſiſtance of him and my Uncle John, and ſome other Relations, I got forty Pounds, and a Promiſe of thirty Pounds a year to maintain me at Leyden: there I ſtudied Phyſick two years and ſeven months, knowing it would be uſeful in long Voyages."
• (obsolete) A physician.
  "Desire is death, which physic did except."

verb

• (transitive) To cure or heal.
  "Wouldſt thou not haue ſome Bulchin from the herd / To phyſicke thee of this venereall itch?"
• (transitive) To administer medicine to, especially a purgative.
  "I will physic your rankness […]"