Docent (noun)

A person who gives tours or lectures, especially in a museum or art gallery.

Origin:

Late 19th century: from german dozent, from latin docent- "teaching", from the verb docere.

Examples:

1. The docent gave us a tour of the museum.
2. She was a docent at the art gallery.
3. The docent was very knowledgeable about the exhibits.
4. He was a docent at the history museum.
5. The docent was able to answer all of our questions.