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a person or thing that reduces.

an oxidizing solution for lessening the density of an exposed negative.
a developing agent.

(in plumbing) a coupling decreasing in diameter at one end.
Compare (def 2).
Historical Examples

The alkali sets the reducer in action and is called the accelerator.
The Barnet Book of Photography Various

Or, is it king Nala the reducer of hostile towns that hath come here?
Mahabharata of Krishna-Dwaipayana Vyasa Bk. 3 Pt. 1 Krishna-Dwaipayana Vyasa

Helen’s next remark was in the natures of a reducer for the said expansion.
The Portygee Joseph Crosby Lincoln

To prepare this reducer, take one part varnish (the same varnish to be reduced), and two parts of turpentine.
Advanced Toy Making for Schools David M. Mitchell

He is not to be dreaded by widows and orphans; he is a reducer of surplusage.
The Gentle Grafter O. Henry

Very many, if not most, slides are all the better for just a touch of a “reducer” such as follows:—The ordinary “hypo.”
The Barnet Book of Photography Various

The destroyer of enemies,” “the reducer of the disobedient,” “the exterminator of rebels,” “he whose sword is good.
Tradition John Francis Arundell

(photog) a chemical solution used to lessen the density of a negative or print by oxidizing some of the blackened silver to soluble silver compounds Compare intensifier (sense 3)
a pipe fitting connecting two pipes of different diameters
a person or thing that reduces


Read Also:

  • Reduce

    to bring down to a smaller extent, size, amount, number, etc.: to reduce one’s weight by 10 pounds. to lower in degree, intensity, etc.: to reduce the speed of a car. to bring down to a lower rank, dignity, etc.: a sergeant reduced to a corporal. to treat analytically, as a complex idea. to lower […]

  • Reduction

    the act of or the state of being . the amount by which something is or diminished. a form produced by ; a copy on a smaller scale. Cell Biology. meiosis, especially the first meiotic cell division in which the chromosome number is by half. Chemistry. the process or result of . Movies. the process […]

  • Reductive

    of or relating to ; serving to reduce or abridge: an urgent need for reductive measures. of or relating to change from one form to another: reductive chemical processes. employing an analysis of a complex subject into a simplified, less detailed form; of, pertaining to, or employing ; reductionistic. something causing or inducing a reductive […]

  • Antireflection coating

    a thin film consisting of one or more layers of transparent material applied to lenses to reduce .

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