14 letters · 29 points in Scrabble
noun branch of chemistry that deals with the chemical action of light
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 chemistry English photochemistry From photo- + chemistry.
Etymology from Wiktionary, CC BY-SA 3.0