Phrase guide

pyrophosphoric acid

noun · 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.

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Pronunciation

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1

noun

Meaning 1

A syrupy liquid formed by the dehydration of phosphoric acid; its salts, the pyrophosphates, are used in medicine.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The acid formed by removing a molecule of water from two molecules of phosphoric acid, H4P2O7; this reaction slowly reverses in the presence of water.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: chemistry, inorganic-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 solid acid formed by reactions of orthophosphoric acid

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: polyphosphoric acid

History

Etymology

From pyro- + phosphoric acid.