(n.) One who uses a telescope.

anesthesiologist bonesetter cardiologist chiropodist chiropractor dermatologist eye doctor eye-ear-nose-throat specialist geriatrician gerontologist gynecologist healer homeopath homeopathist immunologist internist medic microscopist midwife neurologist obstetrician ophthalmologist optician optometrist orthopedist osteopath otolaryngologist otologist pathologist pediatrician pediatrist podiatrist psychiatrist radiologist serologist skin man specialist telescopist therapeutist therapist