photoproton

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 *per-der.?
Proto-Indo-European *per-der.?
Proto-Indo-European *pér
Proto-Indo-European *-o
Proto-Indo-European *próder.
Ancient Greek πρό (pró)
Ancient Greek -ᾰτος (-ătos)
Ancient Greek πρῶτον (prôton)lbor.
English proton
English photoproton
From photo- + proton.