Standard Lemma guide

backflow

noun · verb · 3 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

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No pronunciation record was provided for this word.

1

noun

Meaning 1

The flow of a fluid (through a pipe etc.) in a direction opposite to that which is normal or intended.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: backflux, reflux

Antonyms: none provided

Broader terms: flow, flux

2

verb

Meaning 2

To flow in the wrong or backward direction.

Definition source: English Wiktionary via Wiktextract

Usage: intransitive, transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: backflux, reflux

Antonyms: none provided

Broader terms: flow, flux

3

noun

Meaning 3

a flow that returns toward its source

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: backflowing

Antonyms: none provided

Broader terms: flow, flowing

Narrower terms: regurgitation

History

Etymology

From back + flow.

Across languages

Translations

2 source translations are retained for this English entry.

  • Hungarian: visszaáramlás — the flow of a fluid in a direction opposite to that which is normal or intended
  • Polish: przepływ zwrotny — the flow of a fluid in a direction opposite to that which is normal or intended