16 letters · 27 points in Scrabble
noun sensitivity to the action of radiant energy
originEtymology tree Proto-Indo-European *bʰeh₂- Proto-Indo-European *bʰéh₂os Proto-Hellenic *pʰáwos Ancient Greek φᾰ́ος (phắos) Ancient Greek φῶς (phôs) Ancient Greek φωτο- (phōto-)der. English photo- English sensitivity English photosensitivity From photo- + sensitivity.
Etymology from Wiktionary, CC BY-SA 3.0