<p><strong>Noun, plural</strong></p><ul><li>A·pol·los: the ancient Greek and Roman god of light, healing, music, poetry, prophecy, and manly beauty; the son of Leto and brother of Artemis.</li><li>a very handsome young man.</li><li>Aerospace: one of a series of U.S. spacecraft designed to carry astronauts to the moon and back.</li></ul>