n.
Pronunciation: ˌ s ī -k ō - ' fi-ziks
Function: noun plural but singular in construction
Etymology: International Scientific Vocabulary
Date: 1878
: a branch of psychology concerned with the effect of physical processes (as intensity of stimulation) on the mental processes of an organism
– psy · cho · phys · i · cist \ - ' fi-z ə -sist, - ' fiz-sist \ noun