Standard Lemma guide

bacitracin

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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  • /ˌbæs.ɪˈtɹeɪ.sɪn/

1

noun

Meaning 1

A nonprescription polypeptide antibiotic isolated from a bacillus (Bacillus subtilis or Bacillus licheniformis), usually provided in topical ointment form especially against gram-positive bacteria.

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 polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: antibiotic, antibiotic drug

History

Etymology

From translingual Baci(llus subtilis) + Tracy + -in. Named after American child Margaret Tracy (1936–1994), in whose leg infection the compound was first found.