[ep-uh-fuh-nom-uh-non, -nuhn]
noun, plural epiphenomena [ep-uh-fuh-nom-uh-nuh] , epiphenomenons.
Pathology. a secondary or additional symptom or complication arising during the course of a disease.
any secondary phenomenon.

1700–10; epi- + phenomenon

epiphenomenal, adjective
epiphenomenally, adverb
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World English Dictionary
epiphenomenon (ˌɛpɪfɪˈnɒmɪnən)
n , pl -na
1.  a secondary or additional phenomenon; by-product
2.  pathol an unexpected or atypical symptom or occurrence during the course of a disease

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Word Origin & History

1706, secondary symptom, from epi- + phenomenon. Plural is epiphenomena. Related: Epiphenomenal.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

epiphenomenon ep·i·phe·nom·e·non (ěp'ə-fĭ-nŏm'ə-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.
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Example sentences
Thus again strictly limiting any epiphenomenal dualism allowed in this metaphysic.
The first way is to consider your thoughts ideas, and feelings to be epiphenomenal by-products of the activity of your brain.
But immigration law and policy evolve in an epiphenomenal manner.
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