photophobia Syllabification: (pho·to·pho·bi·a)Pronunciation: /ˌfōtəˈfōbēə/Definition of photophobia noun extreme sensitivity to light. Derivatives photophobicPronunciation: /ˌfōtəˈfōbik/ adjective photophobia in other Oxford dictionaries Definition of photophobia in the British & World English dictionary