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- photoorganoheterotroph
- photo orientation elements
- photooscillogram
- photooxidant
- photooxidation
- photooxidative degradation
- photooxide
- photooxygenation
- photopair
- photoparametric
- photopeak
- photoperiod
- photoperiodical reaction
- photoperiodic induction
- photoperiodic inhibition
- photoperiodicity
- photoperiodism
- photoperiodism(plant)
- photoperspectograph
- photophase
- photophile
- photophobe
- photophobia
- photophobic
- photophoby