[ ep-uh-fuh-nom-uh-non, -nuh n ]
/ ˌɛp ə fəˈnɒm əˌnɒn, -nən /

noun, plural ep·i·phe·nom·e·na [ep-uh-fuh-nom-uh-nuh] /ˌɛp ə fəˈnɒm ə nə/, ep·i·phe·nom·e·nons.

Pathology. a secondary or additional symptom or complication arising during the course of a disease.
any secondary phenomenon.

Nearby words

  1. epiphania,
  2. epiphanize,
  3. epiphany,
  4. epipharynx,
  5. epiphenomenalism,
  6. epiphloedal,
  7. epiphonema,
  8. epiphora,
  9. epiphragm,
  10. epiphylaxis

Origin of epiphenomenon

First recorded in 1700–10; epi- + phenomenon

Related formsep·i·phe·nom·e·nal, adjectiveep·i·phe·nom·e·nal·ly, adverb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for epiphenomenon

British Dictionary definitions for epiphenomenon


/ (ˌɛpɪfɪˈnɒmɪnən) /

noun plural -na (-nə)

a secondary or additional phenomenon; by-product
pathol an unexpected or atypical symptom or occurrence during the course of a disease
Derived Formsepiphenomenal, adjectiveepiphenomenally, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for epiphenomenon



1706, "secondary symptom," from epi- + phenomenon. Plural is epiphenomena. Related: Epiphenomenal.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for epiphenomenon


[ ĕp′ə-fĭ-nŏmə-nŏn′ ]


An additional condition or symptom in the course of a disease, not necessarily connected with the disease.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.