photodynamics

Etymology 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-
Proto-Indo-European *dewh₂-der.
Proto-Hellenic *dunamai
Ancient Greek δῠ́νᾰμαι (dŭ́nămai)
Ancient Greek δύναμις (dúnamis)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ικός (-ikós)
Ancient Greek δυναμικός (dunamikós)lbor.
French dynamiqueder.
English dynamic
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ik
English -ic
Old English -as
Middle English -es
English -s
English -ics
English dynamics
English photodynamics
From photo- + dynamics.