defervesce
C2 (Very Low Frequency)Technical / Medical / Literary
Definition
Meaning
(Of a person or their condition) To stop having a fever; to return to a normal body temperature after a period of fever.
To decrease in intensity or activity, metaphorically likened to a fever subsiding. Also used technically in materials science to describe the cooling of a molten substance.
Linguistics
Semantic Notes
The word is derived from the medical concept of fever (fever -> febrile -> defervescence). It implies a process of cooling down or abatement, most commonly from a heightened or agitated state.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. Slightly more likely to be encountered in formal British medical writing.
Connotations
Clinical, precise, somewhat archaic or highly formal in non-medical contexts.
Frequency
Extremely rare in everyday speech in both varieties. Used almost exclusively in specialized medical or technical texts.
Vocabulary
Collocations
Grammar
Valency Patterns
Subject (Patient/Fever) + defervesceSubject + begin to + defervesceVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “The fever has broken (common alternative expression).”
Usage
Context Usage
Business
Not used.
Academic
Used in medical and clinical research papers to describe patient recovery.
Everyday
Virtually never used; 'the fever went down' or 'their temperature returned to normal' are standard.
Technical
Primary domain. Used in patient notes, medical literature, and in metallurgy/geology for cooling processes.
Examples
By Part of Speech
verb
British English
- The paediatric patient defervesced rapidly after the administration of paracetamol.
- Once the infection was controlled, she began to defervesce.
American English
- The patient defervesced overnight, a positive sign for discharge.
- We expect the lava flow to defervesce over the next 48 hours.
adjective
British English
- The defervescent phase of the illness is when management shifts to hydration.
- A defervescent patient still requires monitoring.
American English
- Defervescent symptoms indicated the treatment was effective.
- The defervescent stage was marked by profuse sweating.
Examples
By CEFR Level
- After two days of high fever, he finally began to defervesce.
- The political scandal, which had dominated headlines for weeks, began to defervesce as public attention shifted.
- Clinical guidelines recommend monitoring vital signs until the patient fully defervesces.
Learning
Memory Aids
Mnemonic
Think: DE-FEVER-ESCE. 'De-' means 'down from' or 'remove', 'fever' is the core, '-esce' is a verb ending meaning 'become'. So, 'to become removed from fever'.
Conceptual Metaphor
INTENSITY IS HEAT / A PROBLEM IS A DISEASE. When a heated situation (argument, crisis) 'defervesces', it cools down, just like a medical fever breaks.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'разрешаться' (to resolve) in a general sense. The core is specifically about temperature/fever. Closest direct equivalent is 'снижаться температура' (for the fever to go down).
Common Mistakes
- Using it as a transitive verb (e.g., 'The medicine defervesced the patient' is incorrect). It is intransitive. Confusing it with 'defenestrate' (to throw out of a window).
Practice
Quiz
In which context is the verb 'defervesce' most accurately used?
FAQ
Frequently Asked Questions
No, it is a highly specialized medical/technical term. You will almost never hear it in everyday conversation, even among native speakers.
Yes, but it is always a metaphorical extension based on the core idea of 'cooling down from a heated state'. For example, 'the market frenzy began to defervesce'. This usage is literary and rare.
The noun is 'defervescence' (e.g., 'the period of defervescence').
Yes. In everyday language, use phrases like 'the fever broke', 'their temperature came down', or 'they got over the fever'.