Glow-in-the-dark is a phenomenon that occurs when certain materials emit light in the dark after being exposed to light. The two crossword solutions for this term are 'EMBER' and 'PHOSPHORESCENCE'. EMBER is a five letter word that refers to a glowing coal or EMBER, which is a small piece of burning wood or coal that continues to glow after the fire has been extinguished. PHOSPHORESCENCE is a fifteen letter word that refers to a type of luminescence, which is the emission of light from a material without heat. This type of light is caused by the absorption of energy from other sources, such as ultraviolet radiation.