reducer

American  

[ri-doo-ser, -dyoo-] / rɪˈdu sər, -ˈdju- /

noun

• reducers
  plural

1. a person or thing that reduces.

2. Photography.

   1. an oxidizing solution for lessening the density of an exposed negative.

   2. a developing agent.

3. (in plumbing) a coupling decreasing in diameter at one end.

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reducer British  

/ rɪˈdjuːsə /

noun

1. 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

2. a pipe fitting connecting two pipes of different diameters

3. a person or thing that reduces

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Other Word Forms

Derived Forms

• antireducer
  noun

Inflected Forms

Nouns

• reducers
  plural

Etymology

Origin of reducer

First recorded in 1520–30; reduce + -er ¹

Example Sentences

See Examples For:

reducer reducers

Adding a safety warning based on flimsy evidence creates its own risks, such as deterring pregnant women from taking the pain killer and fever reducer when they need it.

From The Wall Street Journal ● Oct. 29, 2025

Participating in Veganuary also appears to shift people's identity from seeing themselves as a meat eater to more of a "meat reducer" or "meat excluder".

From Salon ● Jan. 2, 2025

The plant contains dozens of bioactive chemical compounds and is used throughout Southeast Asia and China as a painkiller, fever reducer, and diuretic.

From Science Magazine ● May 1, 2024

Acetaminophen is considered the safest over-the-counter pain reliever and fever reducer available during pregnancy.

From Science Daily ● Jan. 3, 2024

The obscurity of night is a great reducer of ranks.

From "And they thought we wouldn't fight" by Floyd Gibbons

“The second is the component layer beneath them, the motors, reducers, bearings, sensors, and power content inside the machines themselves.”

From Barron's ● Jun. 30, 2026

They may be the companies supplying actuators, reducers, sensors, machine vision, batteries, motion-control systems and industrial software.

From MarketWatch ● May 27, 2026

The components include sensors, so-called coreless motors that power precise high-speed movements and speed reducers often used in joints to mimic human motions.

From The Wall Street Journal ● Apr. 3, 2026

Glen Calder expected a shipment of gearbox reducers needed to build a particular model of his company's paving machines last week.

From Reuters ● Dec. 23, 2022

Boston power transmission products from stock, gears, speed reducers.

From U.S. Copyright Renewals, 1961 January - June by Library of Congress. Copyright Office