phospho-, phosph-, phosphoro-, phosphor- +
(Greek: light, light bringer, shine; morning star; a nonmetallic chemical element that ignites when exposed to air)
Etymologically related "light, shine, glow" word families: ethero-; fulg-; luco-; lumen-, lum-; luna, luni-; lustr-; phengo-; pheno-; photo-; scinti-, scintill-; splendo-.