epiphenomenon
Concise Oxford English Dictionary © 2008 Oxford University Press:
epiphenomenon /ˌɛpɪfəˈnɒmɪnən/
▶noun (pl. epiphenomena /-nə/) a secondary effect or phenomenon.
■ Medicine a secondary symptom, occurring simultaneously with a disease or condition but not directly related to it.
■ a mental state regarded as a by-product of brain activity.
– derivatives
epiphenomenal adjective.
epiphenomenal adjective.
'epiphenomenon' also found in these Oxford entries:

