Phrase guide

hypophosphorous 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 pale yellow liquid, H3PO2, used as 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

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: phosphorous acid, orthophosphorous acid

Antonyms: none provided

Broader terms: oxyacid, oxygen acid

History

Etymology

No etymology was provided for this word.

Across languages

Translations

13 source translations are retained for this English entry.

  • Chinese Mandarin: 次磷酸 — a pale yellow liquid
  • Finnish: hypofosforihapoke — a pale yellow liquid
  • French: acide hypophosphoreux — a pale yellow liquid
  • Hungarian: hipofoszforossav — a pale yellow liquid
  • Icelandic: fosfórundirsýrlingur — a pale yellow liquid
  • Italian: acido ipofosforoso — a pale yellow liquid
  • Polish: kwas fosfinowy — a pale yellow liquid
  • Romanian: acid hipofosforos — a pale yellow liquid
  • Russian: фосфорнова́тистая кислота́ (fosfornovátistaja kislotá) — a pale yellow liquid
  • Russian: гипофо́сфористая кислота́ (gipofósforistaja kislotá) — a pale yellow liquid
  • Spanish: ácido hipofosforoso — a pale yellow liquid
  • Swedish: hypofosfinsyra — a pale yellow liquid
  • Swedish: underfosforsyrlighet — a pale yellow liquid