Standard Lemma guide

reducer

noun · 9 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American: /ɹɪˈdusɚ/
  • Southern-England: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

Something or someone that reduces.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A reducing agent.

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A hydraulic device for reducing pressure and hence increasing movement, used to transmit the load from the hydraulic support of the lower shackle to the lever weighing apparatus in some kinds of heavy testing machine.

Definition source: English Wiktionary via Wiktextract

Topics: engineering, hydraulics, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A liquid used in the process of developing a negative to reduce its darkness.

Definition source: English Wiktionary via Wiktextract

Topics: arts, hobbies, lifestyle, photography

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A component used to connect two pipes of different bores.

Definition source: English Wiktionary via Wiktextract

Topics: business, construction, manufacturing, plumbing

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

A function that takes state and action as arguments and returns the next state of the app.

Definition source: English Wiktionary via Wiktextract

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences, software

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

The reduction of the contribution to a football game of a more talented opponent by intimidation using a brutal tackle.

Definition source: English Wiktionary via Wiktextract

Topics: ball-games, games, hobbies, lifestyle, soccer, sports

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

pipefitting that joins two pipes of different diameter

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: pipefitting, pipe fitting

9

noun

Meaning 9

a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: reducing agent, reductant

Antonyms: none provided

Broader terms: chemical agent

Narrower terms: hydrazine

History

Etymology

Etymology tree English reduce Proto-Indo-European *-yósder. Proto-Italic *-āzios Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English reducer From reduce + -er.

Across languages

Translations

11 source translations are retained for this English entry.

  • Bulgarian: редуктор (reduktor) — something that reduces
  • Finnish: vähentäjä — something that reduces
  • Finnish: heikentäjä — something that reduces
  • French: réducteur — something that reduces
  • German: Reduzierer — something that reduces
  • Spanish: reductor — something that reduces
  • Catalan: rebaixador — photography: developing liquid
  • Finnish: heikenne — photography: developing liquid
  • Finnish: supistaja — plumbing component
  • German: Reduzierung — plumbing component
  • Polish: złączka redukcyjna — plumbing component