Where does “photodecay” come from?

photodecay (English) comes from English photo, from English photography, from French photographie, from Ancient Greek φωτο-, from Ancient Greek φῶς, from Proto-Hellenic pʰáos, from Proto-Indo-European bʰéh₂os, from Proto-Indo-European bʰeh₂-.

photodecay (English): photochemical decay

Definitions

  1. photochemical decay

Ancestry of “photodecay”, step by step

photodecay traces back through two separate lines of ancestry.

via English photo

StepLanguageWordMeaning
1EnglishphotoA photograph; A photo finish; To take a...
2EnglishphotographyThe art and technology of producing images on...
3Frenchphotographiephotography; photograph
4Ancient Greekφωτο-
5Ancient GreekφῶςAttic form of φᾰ́ος
6Proto-Hellenicpʰáos
7Proto-Indo-Europeanbʰéh₂os
8Proto-Indo-Europeanbʰeh₂-to shine, glow light; to speak, say
9Proto-Indo-Europeanbʰeh₂-s-ri-

via English decay

StepLanguageWordMeaning
1EnglishdecayThe process or result of being gradually...
2Middle Englishdecayen
3Anglo-Normandecaeirto fall away, decay, decline
4Medieval Latindecadere
5LatindecidoI fall down or off; collapse; drop, hang down; I...
6LatincadoI fall, I fall out; I die; I cease
7Proto-Italickadōfall, sink
8Proto-Indo-Europeanḱad-to fall
Every word from Proto-Indo-European bʰeh₂-s-ri-