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.
Sound
Pronunciation
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Received-Pronunciation:/ɪˌɹɪθ.ɹə(ʊ)ˈmʌɪ.sɪn/
Southern-England:Recorded audio is listed in the source snapshot.
General-American:/ɪˌɹɪθ.ɹəˈmaɪ.sn̩/
1
noun
Meaning 1
An antibiotic similar to penicillin, used for the treatment of a number of bacterial infections.
Definition source: English Wiktionary via Wiktextract
Usage: countable, 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
A broad-spectrum macrolide antibiotic C37H67NO13 produced by an actinomycete Saccharopolyspora erythraea (formerly Streptomyces erythreus) and similar in its effects to penicillin, administered orally or topically in the treatment of infections caused by Gram-positive bacteria.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
an antibiotic (trade name Erythrocin or E-Mycin or Ethril or Ilosone or Pediamycin) obtained from the actinomycete Streptomyces erythreus; effective against many Gram-positive bacteria and some Gram-negative
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Etymology tree English (Streptomyces) erythr(eus) Ancient Greek -ο- (-o-)der. Latin -o-bor. English -o- English -mycin English erythromycin From (Streptomyces) erythr(eus) + -o- + -mycin (“antibiotic from a Streptomyces strain”).
Across languages
Translations
44 source translations are retained for this English entry.