illuminator

[ ih-loo-muh-ney-ter ]

/ ɪˈlu məˌneɪ tər /

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noun

a person or thing that illuminates.

a device for illuminating, as a light source with a lens or mirror for concentrating light.

a person who paints manuscripts, books, etc., with designs in color, gold, or the like.

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Which of the following nouns has an irregular plural form?

Origin of illuminator

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

A nitron illuminator flashed brilliantly upon shining levers—emergency controls that they hoped they would not have to use.
Astounding Stories, May, 1931|Various
It may not be amiss, also, for the illuminator to remember, that not unfrequently "a verse may find him whom a sermon flies."
The History, Theory, and Practice of Illuminating|M. Digby Wyatt
He traveled far and wide as a teacher and illuminator of men.
Pagan & Christian Creeds|Edward Carpenter
He was munificent in his patronage of the arts, and was himself a skilled illuminator and bookbinder.
Legends & Romances of Brittany|Lewis Spence

He is described in the register of that institution as “illuminator, painter and engraver.”
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3|Various