D defs.my
Entry 2 senses Webster, 1913

Illuminator

/ĭlˌ-o͞om'-ən-ātˌ-ẽr/ · Il·lu·mi·na·tor · IPA /ˌɪlˈuːmənˌeɪtər/
01 n. One whose occupation is to adorn books, especially manuscripts, with miniatures, borders, etc. See Illuminate, v. t., 3.
  1. 1.
    One whose occupation is to adorn books, especially manuscripts, with miniatures, borders, etc. See Illuminate, v. t., 3. See: Illuminate
  2. 2.
    A condenser or reflector of light in optical apparatus; also, an illuminant.