From Longman Dictionary of Contemporary Englishdocentdo‧cent /dəʊˈsent $ doʊ-/ noun [countable] BODLT American English someone who guides visitors through a museum, church etc
Examples from the Corpus
docent• At the J Paul Getty museum in Malibu, a docent was giving her usual tour.• The inside is completely restored, and visitors can sit in the old desks while a docent explains early school days.• The twice-a-week free tours are narrated by museum docents.• He had been offered the position of docent at the University of Warsaw.• She's a volunteer docent at the Smithsonian Institution.Origin docent (1800-1900) German Latin, present participle of docere “to teach” 