<p><strong>Noun</strong></p><ul><li>Any of a number of substances that exhibit luminescence when struck by light of certain wavelengths, as by ultraviolet.</li><li>Literary. A phosphorescent substance.</li></ul><p><strong>Adjective</strong></p><ul><li>Archaic. Phosphorescent.</li></ul><p><strong>End of Response</strong></p>