Definition of "illuminator"

agent noun of illuminate:

1. One who illuminates; an explainer.  examples

2. An artist who adds illustrations and decorations to illuminated manuscripts.  quotations  examples

   Quotations

   • The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, […] . Scribes, illuminators, and scholars held such stones directly over manuscript pages as an aid in seeing what was being written, drawn, or read.

     2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist