Phrase guide

phosphorous acid

noun · 2 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

a yellowish hygroscopic solid, H3PO3; a mild reducing agent

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a clear or yellow monobasic acid (H3PO2)

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: hypophosphorous acid, orthophosphorous acid

Antonyms: none provided

Broader terms: oxyacid, oxygen acid

History

Etymology

No etymology was provided for this word.

Across languages

Translations

8 source translations are retained for this English entry.

  • French: acide phosphoreux — H3PO3
  • German: Phosphonsäure — H3PO3
  • German: phosphorige Säure — H3PO3
  • Japanese: 亜燐酸 (arinsan) — H3PO3
  • Polish: kwas fosfonowy — H3PO3
  • Romanian: acid fosforos — H3PO3
  • Russian: фо́сфористая кислота́ (fósforistaja kislotá) — H3PO3
  • Swedish: fosforsyrlighet — H3PO3