illuminator

[ih-loo-muh-ney-ter]
noun
1.
a person or thing that illuminates.
2.
a device for illuminating, as a light source with a lens or mirror for concentrating light.
3.
a person who paints manuscripts, books, etc., with designs in color, gold, or the like.

Origin:
1475–85; < Late Latin illūminātor, equivalent to illūminā(re) (see illumine) + -tor -tor

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
illuminate
 
vb
1.  (tr) to throw light in or into; light up: to illuminate a room
2.  (tr) to make easily understood; clarify
3.  to adorn, decorate, or be decorated with lights
4.  (tr) to decorate (a letter, page, etc) by the application of colours, gold, or silver
5.  (intr) to become lighted up
 
adj
6.  archaic made clear or bright with light; illuminated
 
n
7.  a person who has or claims to have special enlightenment
 
[C16: from Latin illūmināre to light up, from lūmen light]
 
il'luminative
 
adj
 
il'luminator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
When the printing press was invented, many monks mourned the decline of vellum and the loss of the illuminator's art.
In fiber optic systems the coupling system, with an integrated source and ballast, is housed in what is called the illuminator.
It consists of a flat-plate illuminator fed by xenon arc lamps using optical fibers.
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