DOCTOR (Gr. didaskalos, teacher). The word didaskolos appears many times in the NT, but is rendered “doctor” by KJV only in Luke.2.46. It is usually rendered “master” or “teacher,” whether referring to Jesus or other teachers. It is not to be confused with iatros (“physician”) in passages such as Matt.9.12; Mark.5.26; Luke.4.23.

International Standard Bible Encyclopedia (1915)

dok’-ter: (In Lu 2:46 didaskalos) "doctor" is equivalent to "teacher," which latter is the translation of the Revised Version (British and American). So in Lu 5:17; Ac 5:34, the King James Version and the Revised Version (British and American) "doctors," "doctor," of the law (nomodidaskalos). See Education; Rabbi; Scribes.