Standard Lemma guide

Herx

noun · verb · 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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1

noun

Meaning 1

Alternative form of herx (“Jarisch–Herxheimer reaction”).

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, alternative

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A Jarisch-Herxheimer reaction.

Definition source: English Wiktionary via Wiktextract

Usage: informal

Topics: medicine, sciences

Examples

  • For quotations using this term, see Citations:herx.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

verb

Meaning 3

To experience a Jarisch-Herxheimer reaction, a negative reaction to antibiotic treatment.

Definition source: English Wiktionary via Wiktextract

Usage: informal

Topics: medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Shortened from Jarisch-Herxheimer reaction, which in turn derives from the names of Adolf Jarisch and Karl Herxheimer, physicians who separately described the reaction in syphilis patients.