Illuminator \Il*lu"mi*na`tor\, n. [L., an enlightener, LL. also, an illuminator of books.] 1. One whose occupation is to adorn books, especially manuscripts, with miniatures, borders, etc. See {Illuminate}, v. t., 3. [1913 Webster] 2. A condenser or reflector of light in optical apparatus; also, an illuminant. [1913 Webster]