1. Someone who studies the shimmering or glowing phenomena of lambency in living organisms: The Marine University hired Dr. Lawson, a renown luminologist, to chair the department which studied the underwater plant and animal life which produce a vivid luster.
2. A person who is versed in the study of books with colored illustrations: As a result of her artistic abilities and specialization in ancient manuscripts, Julie was hired by the library as a luminologist to catalogue and repair the illuminations in the manuscript collection.