theban year

from The Collaborative International Dictionary of English v.0.48

Theban \The"ban\, a. [L. Thebanus.]
   Of or pertaining to Thebes.
   [1913 Webster]

   {Theban year} (Anc. Chron.), the Egyptian year of 365 days
      and 6 hours. --J. Bryant.
      [1913 Webster]