Definition of tithonus:
(N) :
In Greek mythology, (or ; ) the lover of Eos, Goddess of the Dawn.
(N) :
"Tithonus" is a poem by the Victorian poet Alfred, Lord Tennyson, originally written in 1833 as "Tithon" and completed in 1859.
(N) :
"Tithonus" is the tenth episode of the sixth season of the American science fiction television series The X-Files.
(N) :
a figure in Greek mythology known for being granted immortality without eternal youth.