eco-
EnglishMerriam-Webster Dictionary> : medicine man
Christianity : an eminent theologian declared a sound expounder of doctrine by the Roman Catholic Church
— called also doctor of the church
: a learned or authoritative teacher
: a person who has earned one of the highest academic degrees (such as a PhD) conferred by a university //Most of the college's faculty members are doctors in their fields. //The class is being taught by Doctor Menzer.