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Webster 1913 Edition

Noun.

One who or that which enlarges.

Noun.

He or that which enlarges, increases, extends or expands; an amplifier.

enlarger ‎(plural enlargers)

Any device that makes something bigger, or makes it appear bigger.
a **** enlarger
(photography) An optical device used to make enlarged prints from a photographic negative

optical device used to make enlarged prints