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1706, "secondary symptom," from epi- + phenomenon. Plural is epiphenomena. Related: Epiphenomenal.
epiphenomenon ep·i·phe·nom·e·non (ěp'ə-fĭ-nŏm'ə-nŏn')n. An additional condition or symptom in the course of a disease, not necessarily connected with the disease.