epiphenomenon [ˌɛpɪfəˈnɒmɪnən] (pl. epiphenomena -nə)
a secondary effect or by-product which arises from but does not causally influence a process, in particular 附带现象,尤指 ■(Medicine)a secondary symptom, occurring simultaneously with a disease or condition but not directly related to it (医)副现象,例外现象 ■a mental state regarded as a by-product of brain activity (心理)副现象