The story
Coined by the inventor Charles Hoxie ca. 1922 from πάλλω (pállō, “shaking”) + φωτός (phōtós, “light”) + φωνή (phōnḗ, “sound”)
Etymology from Wiktionary, CC BY-SA 4.0.
pallophotophone
Today it means: A device that records sounds on photographic film. Full definition →