"admitting of medical treatment, curable, healable," 1610s, from Latin medicabilis "curable," from medicare, medicari "to medicate, heal, cure" (poetic and Late Latin) from medicus "physician, healing" (see medical (adj.)).
"suffering, injured, or sick person under medical treatment," late 14c., from Old French pacient (n.), from the adjective, from Latin patientem "suffering" (see patience). In Middle English also of anyone who suffered patiently.
1590s, "to confer the degree of doctor on," from doctor (n.). Meaning "to treat as a doctor, administer medical treatment to" is from 1712; sense of "alter, disguise for the purpose of deception, falsify" is from 1774. Related: Doctored; doctoring.
"eye doctor," 1610s, from French oculiste (16c.), from Latin oculus "an eye" (from PIE root *okw- "to see"). Middle English had oculister (early 15c.) "an authority on the eye and treatment of eye diseases."