Standard Lemma guide

ochronosis

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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  • Received-Pronunciation: /ˌəʊ.kɹə(ʊ)ˈnəʊ.sɪs/
  • General-American: /ˌoʊ.kɹəˈnoʊ.sɪs/
  • rhymes with -əʊsɪs

1

noun

Meaning 1

Abnormal brown pigmentation of tissue (especially cartilage and ligaments), specifically that resulting from the accumulation of a melanin-like pigment derived from homogentisic acid in the metabolic disorder alkaptonuria.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: medicine, pharmacology, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

an accumulation of dark pigment in cartilage and other connective tissue; usually a symptom of alkaptonuria or phenol poisoning

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: symptom

History

Etymology

Borrowed from German Ochronosis, from Ancient Greek ὠχρός (ōkhrós, “pale yellow, sallow”) + Ancient Greek νόσος (nósos, “sickness, disease, plague”) + -osis (“disease, condition”).