What is "tithonos"

In Greek mythology, Tithonos (Τιθωνός) was a son of Eos and Cephalus. The name of Eos' lover, Tithonus, is also sometimes spelled Tithonos. He is mentioned in Book Eleven of The Iliad as "the haughty Tithonos," by whom Eos slept (Richmond Lattimore translation). In this instance, he is most likely Eos's lover and not her son. He is also mentioned in Book Five of The Odyssey as a lord, and Eos his lady.