It appears in many words related to light, such as:
* Phosphorous: A chemical element that glows in the dark.
* Phosphate: A salt or ester of phosphoric acid.
* Phosphorescent: Emitting light without heat, as in some marine organisms.
* Photogenic: Well-suited to being photographed.
* Photography: The art or process of capturing images with a camera.
The root "phos" is a reminder that light has fascinated and captivated humans for millennia.